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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

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