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Financial structure and financial costs - Fair value hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial structure, financial costs and financial instruments        
Equity instruments $ 1,051 $ 1,625 $ 2,007 $ 1,778
Measured at fair value | Financial instruments, excluding commodity contracts        
Financial structure, financial costs and financial instruments        
Assets and liabilities held for trading 214 82 (68)  
Equity instruments 33 501 706  
Total fair value (2,978) (430) 2,183  
Measured at fair value | Financial instruments, excluding commodity contracts | Level 1        
Financial structure, financial costs and financial instruments        
Equity instruments 33 501 706  
Total fair value 33 501 706  
Measured at fair value | Financial instruments, excluding commodity contracts | Level 2        
Financial structure, financial costs and financial instruments        
Assets and liabilities held for trading 214 82 (68)  
Total fair value (3,011) (931) 1,477  
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 (1,275) 39 1,137  
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 (1,275) 39 1,137  
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts        
Financial structure, financial costs and financial instruments        
Hedge instruments (1,950) (1,052) 408  
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2        
Financial structure, financial costs and financial instruments        
Hedge instruments $ (1,950) $ (1,052) $ 408