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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, 2019
Dec. 31, 2018
Trading liabilities    
Liabilities    
Transfers from Level 1 to Level 2 $ 117 $ 79
Transfers from Level 2 to Level 1 198 1,821
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 0
Transfers from Level 2 to Level 1 117 138
Financial investments    
Assets    
Transfers from Level 1 to Level 2 1,526 367
Transfers from Level 2 to Level 1 2,696 17,861
Trading assets    
Assets    
Transfers from Level 1 to Level 2 663 435
Transfers from Level 2 to Level 1 1,252 4,959
Designated and otherwise mandatorily measured at fair value    
Assets    
Transfers from Level 1 to Level 2 0 2
Transfers from Level 2 to Level 1 347 85
Derivatives    
Assets    
Transfers from Level 1 to Level 2 23 1
Transfers from Level 2 to Level 1 $ 111 $ 128