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Fair values of financial instruments carried at fair value - Transfers between Level 1 and Level 2 fair values (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Trading liabilities    
Liabilities    
Transfers from Level 1 to Level 2 $ 155 $ 278
Transfers from Level 2 to Level 1 433 220
Designated at fair value    
Liabilities    
Transfers from Level 1 to Level 2 7,414 0
Transfers from Level 2 to Level 1 0 0
Derivatives    
Liabilities    
Transfers from Level 1 to Level 2 0 0
Transfers from Level 2 to Level 1 0 117
Financial investments    
Assets    
Transfers from Level 1 to Level 2 4,514 7,965
Transfers from Level 2 to Level 1 7,764 4,184
Trading assets    
Assets    
Transfers from Level 1 to Level 2 3,891 3,304
Transfers from Level 2 to Level 1 5,517 2,726
Designated and otherwise mandatorily measured at fair value    
Assets    
Transfers from Level 1 to Level 2 245 0
Transfers from Level 2 to Level 1 328 673
Derivatives    
Assets    
Transfers from Level 1 to Level 2 0 24
Transfers from Level 2 to Level 1 $ 1 $ 111