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Financial instruments - additional disclosures (Details 2) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Contract or underlying principal amout [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments $ 8,043 $ 13,347
Positive fair values [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments 204 105
Negative fair values [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments (55) (68)
Derivative financial instruments, at fair value currency related [member] | Contract or underlying principal amout [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts 7,907 13,248
Derivative financial instruments, commodity purchase contract 97 17
Derivative financial instruments, options on equity securities 39 82
Derivative financial instruments, at fair value currency related [member] | Positive fair values [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts 189 92
Derivative financial instruments, commodity purchase contract 15 13
Derivative financial instruments, at fair value currency related [member] | Negative fair values [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts (41) (35)
Derivative financial instruments, options on equity securities $ (14) $ (33)