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Derivative Instruments and Hedging Activities - Schedule of Derivative Instruments Designated as Fair Value Hedges, Gain (Loss) (Details) - 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] |  |  |  |
Interest and fees on finance receivables and loans | $ 2,674 | $ 2,889 | $ 8,007 | $ 8,561
Interest and dividends on investment securities and other earning assets | 250 | 262 | 728 | 793
Interest on long-term debt | 265 | 256 | 794 | 748
Loss on cash flow hedges to be recognized within twelve months |  |  | 18 |
Total derivatives designated as accounting hedges | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on fair value hedging relationships | 0 | 0 | 0 | 0
Total loss on cash flow hedging relationships | (8) | (4) | (23) | (7)
Total derivatives designated as accounting hedges | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on fair value hedging relationships | 0 | 0 | 0 | 0
Total loss on cash flow hedging relationships | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on fair value hedging relationships | 0 | 0 | 0 | 0
Total loss on cash flow hedging relationships | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Hedged available-for-sale securities | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in unrealized gain (loss) on hedged item in fair value hedge | 0 | 0 | 0 | 0
Change in unrealized gain (loss) on fair value hedging instruments | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Hedged available-for-sale securities | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in unrealized gain (loss) on hedged item in fair value hedge | 10 | 327 | 224 | 94
Change in unrealized gain (loss) on fair value hedging instruments | (10) | (327) | (224) | (94)
Total derivatives designated as accounting hedges | Hedged available-for-sale securities | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in unrealized gain (loss) on hedged item in fair value hedge | 0 | 0 | 0 | 0
Change in unrealized gain (loss) on fair value hedging instruments | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Fixed-rate automotive loans | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in unrealized gain (loss) on hedged item in fair value hedge | 7 | 190 | 48 | 107
Change in unrealized gain (loss) on fair value hedging instruments | (7) | (190) | (48) | (107)
Total derivatives designated as accounting hedges | Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in unrealized gain (loss) on hedged item in fair value hedge | 0 | 0 | 0 | 0
Change in unrealized gain (loss) on fair value hedging instruments | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Fixed-rate automotive loans | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in unrealized gain (loss) on hedged item in fair value hedge | 0 | 0 | 0 | 0
Change in unrealized gain (loss) on fair value hedging instruments | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Hedged variable-rate commercial loans | Interest and fees on finance receivables and loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest rate cash flow hedge loss reclassified to earnings | (8) | (4) | (23) | (7)
Total derivatives designated as accounting hedges | Hedged variable-rate commercial loans | Interest and dividends on investment securities and other earning assets |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest rate cash flow hedge loss reclassified to earnings | 0 | 0 | 0 | 0
Total derivatives designated as accounting hedges | Hedged variable-rate commercial loans | Interest on long-term debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest rate cash flow hedge loss reclassified to earnings | $ 0 | $ 0 | $ 0 | $ 0

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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