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Derivative Instruments and Hedging Activities - Schedule of Interest and Amortization on Derivative Instruments (Details) - Total derivatives 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
Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on fair value hedging relationships | $ 16 | $ 62 | $ 54 | $ 218
Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on fair value hedging relationships | 21 | 56 | 62 | 164
Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on fair value hedging relationships | 2 | 3 | 7 | 9
Unsecured debt | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Unsecured debt | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Unsecured debt | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 2 | 2 | 7 | 7
Federal Home Loan Bank certificates and obligations | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Federal Home Loan Bank certificates and obligations | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Federal Home Loan Bank certificates and obligations | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 1 | 0 | 2
Hedged available-for-sale securities | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Gain on interest for qualifying hedge | 0 | 0 | 0 | 0
Hedged available-for-sale securities | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 4 | 6 | 13 | 17
Gain on interest for qualifying hedge | 17 | 50 | 49 | 147
Hedged available-for-sale securities | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Gain on interest for qualifying hedge | 0 | 0 | 0 | 0
Fixed-rate automotive loans | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | (1) | 3 | 3 | 12
Gain on interest for qualifying hedge | 17 | 59 | 51 | 206
Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Gain on interest for qualifying hedge | 0 | 0 | 0 | 0
Fixed-rate automotive loans | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain on amortization of deferred basis adjustments | 0 | 0 | 0 | 0
Gain on interest for qualifying hedge | $ 0 | $ 0 | $ 0 | $ 0

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