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Financial structure and financial costs - Fair value hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial structure, financial costs and financial instruments        
Equity instruments $ 2,007 $ 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 (68) 82 (71)  
Equity instruments 706 240 94  
Total fair value 2,183 (1,283) (1,492)  
Measured at fair value | Financial instruments, excluding commodity contracts | Level 1        
Financial structure, financial costs and financial instruments        
Equity instruments 706 240 94  
Total fair value 706 240 94  
Measured at fair value | Financial instruments, excluding commodity contracts | Level 2        
Financial structure, financial costs and financial instruments        
Assets and liabilities held for trading (68) 82 (71)  
Total fair value 1,477 (1,523) (1,586)  
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 1,137 (690) (1,209)  
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 1,137 (690) (1,209)  
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts        
Financial structure, financial costs and financial instruments        
Hedge instruments 408 (915) (306)  
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2        
Financial structure, financial costs and financial instruments        
Hedge instruments $ 408 $ (915) $ (306)