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Financial instruments - additional disclosures (Details 11) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Ten day loss fair value VAR model [line items]    
All financial instruments $ 587 $ 355
Instruments sensitive to foreign currency exchange rates 199 89
Instruments sensitive to equity market movements 62 31
Instruments sensitive to interest rates 197 187
Average    
Ten day loss fair value VAR model [line items]    
All financial instruments 568 348
Instruments sensitive to foreign currency exchange rates 225 143
Instruments sensitive to equity market movements 78 36
Instruments sensitive to interest rates 329 233
High    
Ten day loss fair value VAR model [line items]    
All financial instruments 659 385
Instruments sensitive to foreign currency exchange rates 515 195
Instruments sensitive to equity market movements 261 81
Instruments sensitive to interest rates 912 303
Low    
Ten day loss fair value VAR model [line items]    
All financial instruments 322 303
Instruments sensitive to foreign currency exchange rates 71 86
Instruments sensitive to equity market movements 21 16
Instruments sensitive to interest rates $ 173 $ 187