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Financial structure and financial costs - Fair value hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial structure, financial costs and financial instruments      
Equity instruments $ 1,421 $ 1,727 $ 1,133
Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Assets and liabilities held for trading (71) 216 37
Equity instruments 94    
Assets available for sale   100 120
Total fair value (1,492) (143) (2,847)
Measured at fair value | Financial instruments, excluding commodity contracts | Level 1      
Financial structure, financial costs and financial instruments      
Equity instruments 94    
Assets available for sale   100 120
Total fair value 94 100 120
Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Assets and liabilities held for trading (71) 216 37
Total fair value (1,586) (243) (2,967)
Hedging of Financial Debt (Fair value hedge) | Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Hedge instruments (1,209) (599) (2,462)
Hedging of Financial Debt (Fair value hedge) | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Hedge instruments (1,209) (599) (2,462)
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Hedge instruments (306) 140 (542)
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Hedge instruments $ (306) $ 140 $ (542)