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Derivatives and Hedging Activities Derivatives in statement of income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
Economic hedges $ 3 $ 1 $ 18 $ 12
Variation margin on derivatives (1) (17) (1) (34)
Noninterest income (loss) - Derivatives and hedging activities 2 (16) 17 (22)
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Economic hedges 6 0 20 10
Mortgage delivery commitments        
Derivative Instruments, Gain (Loss) [Line Items]        
Economic hedges (4) (1) (4) 1
Other        
Derivative Instruments, Gain (Loss) [Line Items]        
Economic hedges $ 1 $ 2 $ 2 $ 1