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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, 2020
Dec. 31, 2019
Trading liabilities    
Liabilities    
Transfers from Level 1 to Level 2 $ 98 $ 278
Transfers from Level 2 to Level 1 355 220
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 1,342 7,965
Transfers from Level 2 to Level 1 4,353 4,184
Trading assets    
Assets    
Transfers from Level 1 to Level 2 2,132 3,304
Transfers from Level 2 to Level 1 3,025 2,726
Designated and otherwise mandatorily measured at fair value    
Assets    
Transfers from Level 1 to Level 2 217 0
Transfers from Level 2 to Level 1 154 673
Derivatives    
Assets    
Transfers from Level 1 to Level 2 0 24
Transfers from Level 2 to Level 1 $ 1 $ 111