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Derivative Instruments and Hedging Activities - Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged liability, fair value hedge | $ 5,378 | $ 5,987
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Available-for-sale securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, fair value hedge | $ 15,785 | $ 15,194
Hedged asset, fair value hedge, cumulative increase (decrease) | $ (84) | $ (248)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Available-for-sale securities (amortized cost of $25,772 and $26,810) | Available-for-sale securities (amortized cost of $25,772 and $26,810)
Closed portfolio and beneficial interest, last-of-layer, amortized cost | $ 14,200 | $ 13,900
Amortized cost | 14,000 | 13,600
Cumulative basis adjustment for active hedges, asset (liability) | (88) | (209)
Hedged asset, last-of-layer, amount | 12,000 | 12,000
Available-for-sale securities | Total derivatives designated as accounting hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment for active hedges, asset (liability) | 11 | (106)
Finance receivables and loans, net |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, fair value hedge | 41,802 | 34,493
Hedged asset, fair value hedge, cumulative increase (decrease) | $ (19) | $ (51)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Finance receivables and loans, net | Finance receivables and loans, net
Cumulative basis adjustment for active hedges, asset (liability) | $ (19) | $ (51)
Hedged asset, last-of-layer, amount | 21,600 | 20,100
Closed portfolio, carrying value | 40,900 | 33,400
Finance receivables and loans, net | Total derivatives designated as accounting hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment for active hedges, asset (liability) | (12) | (41)
Long-term debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged liability, fair value hedge, cumulative increase (decrease) | 86 | 88
Discontinued hedge | Available-for-sale securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) | (100) | (132)
Cumulative basis adjustment for active hedges, asset (liability) | (99) | (103)
Discontinued hedge | Finance receivables and loans, net |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) | (7) | (10)
Cumulative basis adjustment for active hedges, asset (liability) | (7) | (10)
Discontinued hedge | Long-term debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged liability, discontinued fair value hedge, cumulative increase (decrease) | $ 86 | $ 88

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