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Derivative Instruments and Hedging Activities (Interest and Amortization on Derivative Instruments) (Details) - Total derivatives designated as accounting hedges - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Interest and fees on finance receivables and loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gain on fair value hedging relationships | $ 87 | $ 172
Interest and dividends on investment securities and other earning assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gain on fair value hedging relationships | 54 | 18
Interest on long-term debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gain on fair value hedging relationships | 3 | 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 | 1 | 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 | 6 | 5
Gain on interest for qualifying hedge | 48 | 13
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 | 5 | 10
Gain on interest for qualifying hedge | 82 | 162
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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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