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Derivative Instruments and Hedging Activities - Schedule of Statement of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income (Details) - Total derivatives not designated as accounting hedges - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings $ 1 $ 7 $ 0 $ 21
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 0 6 1 16
Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 1 (1) (1) 1
Other credit derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 0 1 0 1
Equity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 0 1 0 3
Gain on mortgage and automotive loans, net | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 0 6 1 16
Other operating expenses | Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 1 (1) (1) 1
Other income, net of losses | Other credit derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings 0 1 0 1
Other income, net of losses | Equity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain recognized in earnings $ 0 $ 1 $ 0 $ 3