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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, 2022
Dec. 31, 2021
Trading liabilities    
Liabilities    
Transfers from Level 1 to Level 2 $ 55 $ 181
Transfers from Level 2 to Level 1 203 638
Designated at fair value    
Liabilities    
Transfers from Level 1 to Level 2 0 0
Transfers from Level 2 to Level 1 0 0
Derivatives    
Liabilities    
Transfers from Level 1 to Level 2 0 212
Transfers from Level 2 to Level 1 0 0
Financial investments    
Assets    
Transfers from Level 1 to Level 2 2,407 8,477
Transfers from Level 2 to Level 1 4,066 6,007
Trading assets    
Assets    
Transfers from Level 1 to Level 2 1,937 6,553
Transfers from Level 2 to Level 1 3,488 4,132
Designated and otherwise mandatorily measured at fair value    
Assets    
Transfers from Level 1 to Level 2 538 1,277
Transfers from Level 2 to Level 1 99 768
Derivatives    
Assets    
Transfers from Level 1 to Level 2 0 103
Transfers from Level 2 to Level 1 $ 0 $ 0