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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, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged liability, fair value hedge | $ 7,765 | $ 7,750
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 | $ 15,937 | $ 16,302
Hedged asset, fair value hedge, cumulative increase (decrease) | $ (278) | $ (79)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Available-for-sale securities (amortized cost of $28,114 and $28,416) | Available-for-sale securities (amortized cost of $28,114 and $28,416)
Closed portfolio and beneficial interest, last-of-layer, amortized cost | $ 14,500 | $ 14,800
Amortized cost | 14,200 | 14,600
Basis adjustment for active hedge | (225) | (45)
Hedged asset, last-of-layer, amount | 11,300 | 11,300
Available-for-sale securities | Total derivatives designated as accounting hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Basis adjustment for active hedge | (109) | 75
Finance receivables and loans, net |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, fair value hedge | 47,482 | 54,189
Hedged asset, fair value hedge, cumulative increase (decrease) | $ (181) | $ (93)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Finance receivables and loans, net | Finance receivables and loans, net
Basis adjustment for active hedge | $ (181) | $ (93)
Hedged asset, last-of-layer, amount | 19,700 | 23,200
Closed portfolio, carrying value | 41,000 | 50,000
Finance receivables and loans, net | Total derivatives designated as accounting hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Basis adjustment for active hedge | (160) | (66)
Long-term debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged liability, fair value hedge, cumulative increase (decrease) | 97 | 100
Discontinued hedge | Available-for-sale securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) | (151) | (156)
Basis adjustment for active hedge | (116) | (120)
Discontinued hedge | Finance receivables and loans, net |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) | (21) | (27)
Basis adjustment for active hedge | (21) | (27)
Discontinued hedge | Long-term debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged liability, discontinued fair value hedge, cumulative increase (decrease) | $ 97 | $ 100

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