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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Interest and fees on finance receivables and loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gain on fair value hedging relationships | $ 21 | $ 87
Interest and dividends on investment securities and other earning assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gain on fair value hedging relationships | 22 | 54
Interest on long-term debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gain on fair value hedging relationships | 2 | 3
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
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
Unsecured debt | Interest on long-term debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain on amortization of deferred basis adjustments | 2 | 2
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
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
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
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
Gain on interest for qualifying hedge | 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 | 5 | 6
Gain on interest for qualifying hedge | 17 | 48
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
Gain on interest for qualifying hedge | 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 | 2 | 5
Gain on interest for qualifying hedge | 19 | 82
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
Gain on interest for qualifying hedge | 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
Gain on interest for qualifying hedge | $ 0 | $ 0

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