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Financial structure and financial costs - Fair value hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial structure, financial costs and financial instruments      
Equity instruments $ 1,778 $ 1,421 $ 1,727
Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Assets and liabilities held for trading 82 (71) 216
Equity instruments 240 94  
Assets available for sale     100
Total fair value (1,283) (1,492) (143)
Measured at fair value | Financial instruments, excluding commodity contracts | Level 1      
Financial structure, financial costs and financial instruments      
Equity instruments 240 94  
Assets available for sale     100
Total fair value 240 94 100
Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Assets and liabilities held for trading 82 (71) 216
Total fair value (1,523) (1,586) (243)
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 (690) (1,209) (599)
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 (690) (1,209) (599)
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Hedge instruments (915) (306) 140
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Hedge instruments $ (915) $ (306) $ 140