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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
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Trading liabilities    
Liabilities    
Transfers from Level 1 to Level 2 $ 43 $ 155
Transfers from Level 2 to Level 1 530 433
Designated at fair value    
Liabilities    
Transfers from Level 1 to Level 2 0 7,414
Transfers from Level 2 to Level 1 0 0
Derivatives    
Liabilities    
Transfers from Level 1 to Level 2 212 0
Transfers from Level 2 to Level 1 0 0
Financial investments    
Assets    
Transfers from Level 1 to Level 2 5,421 4,514
Transfers from Level 2 to Level 1 4,774 7,764
Trading assets    
Assets    
Transfers from Level 1 to Level 2 3,601 3,891
Transfers from Level 2 to Level 1 2,381 5,517
Designated and otherwise mandatorily measured at fair value    
Assets    
Transfers from Level 1 to Level 2 150 245
Transfers from Level 2 to Level 1 645 328
Derivatives    
Assets    
Transfers from Level 1 to Level 2 103 0
Transfers from Level 2 to Level 1 $ 0 $ 1