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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, 2024
Dec. 31, 2023
Derivatives    
Liabilities    
Transfers from Level 1 to Level 2 $ 0 $ 0
Transfers from Level 2 to Level 1 0 0
Trading liabilities    
Liabilities    
Transfers from Level 1 to Level 2 191 54
Transfers from Level 2 to Level 1 159 309
Designated at fair value    
Liabilities    
Transfers from Level 1 to Level 2 0 0
Transfers from Level 2 to Level 1 0 0
Financial investments    
Assets    
Transfers from Level 1 to Level 2 13,511 13,200
Transfers from Level 2 to Level 1 10,752 9,975
Trading assets    
Assets    
Transfers from Level 1 to Level 2 9,246 8,066
Transfers from Level 2 to Level 1 6,060 5,758
Designated and otherwise mandatorily measured at fair value    
Assets    
Transfers from Level 1 to Level 2 1,540 1,709
Transfers from Level 2 to Level 1 3,042 2,477
Derivatives    
Assets    
Transfers from Level 1 to Level 2 0 0
Transfers from Level 2 to Level 1 $ 0 $ 0