| 
                Total assets
             | 
                        
                45.8B
             | 
                        
                50.8B
             | 
                        
                46.9B
             | 
                        
                48.1B
             | 
                    
                
                        | 
                Current assets
             | 
                        
                9.3B
             | 
                        
                8.3B
             | 
                        
                9.4B
             | 
                        
                8.0B
             | 
                    
                
                        | 
                Cash
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash equivalents
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash and cash equivalents
             | 
                        
                2.6B
             | 
                        
                368M
             | 
                        
                422M
             | 
                        
                504M
             | 
                    
                
                        | 
                Other short term investments
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accounts receivable
             | 
                        
                2.7B
             | 
                        
                1.9B
             | 
                        
                2.6B
             | 
                        
                1.7B
             | 
                    
                
                        | 
                Other receivables
             | 
                        
                521.5M
             | 
                        
                917M
             | 
                        
                731M
             | 
                        
                592M
             | 
                    
                
                        | 
                Inventory
             | 
                        
                1.4B
             | 
                        
                1.5B
             | 
                        
                1.5B
             | 
                        
                1.3B
             | 
                    
                
                        | 
                Prepaid assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Restricted cash
             | 
                        
                92.7M
             | 
                        
                86M
             | 
                        
                106M
             | 
                        
                72M
             | 
                    
                
                        | 
                Assets held for sale
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                13M
             | 
                    
                
                        | 
                Hedging assets
             | 
                        
                730.3M
             | 
                        
                1.2B
             | 
                        
                2.4B
             | 
                        
                2.2B
             | 
                    
                
                        | 
                Other current assets
             | 
                        
                1.3B
             | 
                        
                2.3B
             | 
                        
                1.6B
             | 
                        
                1.5B
             | 
                    
                
                        | 
                Non current assets
             | 
                        
                36.5B
             | 
                        
                42.5B
             | 
                        
                37.5B
             | 
                        
                40.1B
             | 
                    
                
                        | 
                Properties
             | 
                        
                33.0B
             | 
                        
                38.4B
             | 
                        
                35.9B
             | 
                        
                35.1B
             | 
                    
                
                        | 
                Land and improvements
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Machinery furniture equipment
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Construction in progress
             | 
                        
                1.1B
             | 
                        
                1.1B
             | 
                        
                630M
             | 
                        
                399M
             | 
                    
                
                        | 
                Leases
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accumulated depreciation
             | 
                        
                -15.7B
             | 
                        
                -17.4B
             | 
                        
                -16.7B
             | 
                        
                -15.9B
             | 
                    
                
                        | 
                Goodwill
             | 
                        
                727.7M
             | 
                        
                850M
             | 
                        
                94M
             | 
                        
                —
             | 
                    
                
                        | 
                Investment properties
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Financial assets
             | 
                        
                322.3M
             | 
                        
                995M
             | 
                        
                1.3B
             | 
                        
                949M
             | 
                    
                
                        | 
                Intangible assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Investments and advances
             | 
                        
                554.4M
             | 
                        
                563M
             | 
                        
                202M
             | 
                        
                174M
             | 
                    
                
                        | 
                Other non current assets
             | 
                        
                16.9B
             | 
                        
                18.4B
             | 
                        
                16.2B
             | 
                        
                17.7B
             | 
                    
                
                        | 
                Total liabilities
             | 
                        
                34.1B
             | 
                        
                39.5B
             | 
                        
                35.5B
             | 
                        
                36.5B
             | 
                    
                
                        | 
                Current liabilities
             | 
                        
                5.9B
             | 
                        
                6.3B
             | 
                        
                7.8B
             | 
                        
                8.0B
             | 
                    
                
                        | 
                Accounts payable
             | 
                        
                —
             | 
                        
                —
             | 
                        
                2.8B
             | 
                        
                1.8B
             | 
                    
                
                        | 
                Accrued expenses
             | 
                        
                —
             | 
                        
                —
             | 
                        
                906M
             | 
                        
                737M
             | 
                    
                
                        | 
                Short term debt
             | 
                        
                890.6M
             | 
                        
                1.8B
             | 
                        
                1.3B
             | 
                        
                3.3B
             | 
                    
                
                        | 
                Deferred revenue
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Tax payable
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Pensions
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current liabilities
             | 
                        
                1.6B
             | 
                        
                1.9B
             | 
                        
                2.8B
             | 
                        
                2.1B
             | 
                    
                
                        | 
                Non current liabilities
             | 
                        
                28.2B
             | 
                        
                33.2B
             | 
                        
                27.7B
             | 
                        
                28.5B
             | 
                    
                
                        | 
                Long term provisions
             | 
                        
                10.8B
             | 
                        
                14.1B
             | 
                        
                12.7B
             | 
                        
                12.8B
             | 
                    
                
                        | 
                Long term debt
             | 
                        
                6.4B
             | 
                        
                7.5B
             | 
                        
                4.5B
             | 
                        
                4.9B
             | 
                    
                
                        | 
                Provision for risks and charges
             | 
                        
                3.9B
             | 
                        
                3.7B
             | 
                        
                2.9B
             | 
                        
                0
             | 
                    
                
                        | 
                Deferred liabilities
             | 
                        
                2.9B
             | 
                        
                3.2B
             | 
                        
                3.0B
             | 
                        
                3.7B
             | 
                    
                
                        | 
                Derivative product liabilities
             | 
                        
                345.7M
             | 
                        
                419M
             | 
                        
                983M
             | 
                        
                513M
             | 
                    
                
                        | 
                Other non current liabilities
             | 
                        
                2.2B
             | 
                        
                2.4B
             | 
                        
                2.4B
             | 
                        
                2.3B
             | 
                    
                
                        | 
                Shareholders equity
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                    
                
                        | 
                Common stock
             | 
                        
                9.9B
             | 
                        
                12.4B
             | 
                        
                13.3B
             | 
                        
                0
             | 
                    
                
                        | 
                Retained earnings
             | 
                        
                3.5B
             | 
                        
                761M
             | 
                        
                -496M
             | 
                        
                0
             | 
                    
                
                        | 
                Other shareholders equity
             | 
                        
                -2.0B
             | 
                        
                -2.2B
             | 
                        
                -1.8B
             | 
                        
                -31M
             | 
                    
                
                        | 
                Total shareholders equity
             | 
                        
                11.7B
             | 
                        
                11.3B
             | 
                        
                11.4B
             | 
                        
                11.6B
             | 
                    
                
                        | 
                Additional paid in capital
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Treasury stock
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Minority interest
             | 
                        
                323.1M
             | 
                        
                361M
             | 
                        
                354M
             | 
                        
                395M
             |