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Finance Receivables and Loans, Net (Financing Receivable Gross Charge-Offs) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | $ 1 |  | $ 239
Year two, originated, current fiscal year, writeoff | 182 |  | 1,034
Year three, originated, current fiscal year, writeoff | 263 |  | 680
Year four, originated, current fiscal year, writeoff | 153 |  | 197
Year five, originated, current fiscal year, writeoff | 41 |  | 221
More than five years before current fiscal year, writeoff | 49 |  | 151
Revolving loans | 65 |  | 188
Revolving loans converted to term | 4 |  | 10
Total | 758 | $ 601 | 2,720
Write-downs from transfers to held-for-sale | 5 |  |
Consumer |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 1 |  | 239
Year two, originated, current fiscal year, writeoff | 182 |  | 1,034
Year three, originated, current fiscal year, writeoff | 263 |  | 680
Year four, originated, current fiscal year, writeoff | 153 |  | 197
Year five, originated, current fiscal year, writeoff | 41 |  | 142
More than five years before current fiscal year, writeoff | 49 |  | 123
Revolving loans | 64 |  | 165
Revolving loans converted to term | 4 |  | 10
Total | 757 |  | 2,590
Consumer | Automotive |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 1 |  | 225
Year two, originated, current fiscal year, writeoff | 182 |  | 952
Year three, originated, current fiscal year, writeoff | 263 |  | 651
Year four, originated, current fiscal year, writeoff | 152 |  | 194
Year five, originated, current fiscal year, writeoff | 41 |  | 142
More than five years before current fiscal year, writeoff | 49 |  | 120
Revolving loans | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total | 688 | 536 | 2,284
Write-downs from transfers to held-for-sale | 5 |  | 41
Consumer | Consumer mortgage |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 0 |  | 0
Year two, originated, current fiscal year, writeoff | 0 |  | 0
Year three, originated, current fiscal year, writeoff | 0 |  | 0
Year four, originated, current fiscal year, writeoff | 1 |  | 0
Year five, originated, current fiscal year, writeoff | 0 |  | 0
More than five years before current fiscal year, writeoff | 0 |  | 3
Revolving loans | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total | 1 | 1 | 3
Write-downs from transfers to held-for-sale | 0 |  |
Consumer | Mortgage Finance |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 0 |  | 0
Year two, originated, current fiscal year, writeoff | 0 |  | 0
Year three, originated, current fiscal year, writeoff | 0 |  | 0
Year four, originated, current fiscal year, writeoff | 1 |  | 0
Year five, originated, current fiscal year, writeoff | 0 |  | 0
More than five years before current fiscal year, writeoff | 0 |  | 1
Revolving loans | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total | 1 |  | 1
Consumer | Mortgage — Legacy |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff |  |  | 0
Year two, originated, current fiscal year, writeoff |  |  | 0
Year three, originated, current fiscal year, writeoff |  |  | 0
Year four, originated, current fiscal year, writeoff |  |  | 0
Year five, originated, current fiscal year, writeoff |  |  | 0
More than five years before current fiscal year, writeoff |  |  | 2
Revolving loans |  |  | 0
Revolving loans converted to term |  |  | 0
Total |  |  | 2
Consumer | Other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 0 |  | 14
Year two, originated, current fiscal year, writeoff | 0 |  | 82
Year three, originated, current fiscal year, writeoff | 0 |  | 29
Year four, originated, current fiscal year, writeoff | 0 |  | 3
Year five, originated, current fiscal year, writeoff | 0 |  | 0
More than five years before current fiscal year, writeoff | 0 |  | 0
Revolving loans | 64 |  | 165
Revolving loans converted to term | 4 |  | 10
Total | 68 | 64 | 303
Write-downs from transfers to held-for-sale | 0 |  | 174
Consumer | Personal Lending |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff |  |  | 14
Year two, originated, current fiscal year, writeoff |  |  | 82
Year three, originated, current fiscal year, writeoff |  |  | 29
Year four, originated, current fiscal year, writeoff |  |  | 3
Year five, originated, current fiscal year, writeoff |  |  | 0
More than five years before current fiscal year, writeoff |  |  | 0
Revolving loans |  |  | 0
Revolving loans converted to term |  |  | 0
Total |  |  | 128
Consumer | Credit Card |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 0 |  | 0
Year two, originated, current fiscal year, writeoff | 0 |  | 0
Year three, originated, current fiscal year, writeoff | 0 |  | 0
Year four, originated, current fiscal year, writeoff | 0 |  | 0
Year five, originated, current fiscal year, writeoff | 0 |  | 0
More than five years before current fiscal year, writeoff | 0 |  | 0
Revolving loans | 64 |  | 165
Revolving loans converted to term | 4 |  | 10
Total | 68 |  | 175
Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 0 |  | 0
Year two, originated, current fiscal year, writeoff | 0 |  | 0
Year three, originated, current fiscal year, writeoff | 0 |  | 0
Year four, originated, current fiscal year, writeoff | 0 |  | 0
Year five, originated, current fiscal year, writeoff | 0 |  | 79
More than five years before current fiscal year, writeoff | 0 |  | 28
Revolving loans | 1 |  | 23
Revolving loans converted to term | 0 |  | 0
Total | 1 | $ 0 | 130
Write-downs from transfers to held-for-sale | 0 |  |
Commercial | Automotive |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff | 0 |  | 0
Year two, originated, current fiscal year, writeoff | 0 |  | 0
Year three, originated, current fiscal year, writeoff | 0 |  | 0
Year four, originated, current fiscal year, writeoff | 0 |  | 0
Year five, originated, current fiscal year, writeoff | 0 |  | 0
More than five years before current fiscal year, writeoff | 0 |  | 5
Revolving loans | 1 |  | 19
Revolving loans converted to term | 0 |  | 0
Total | $ 1 |  | 24
Commercial | Other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one, originated, current fiscal year, writeoff |  |  | 0
Year two, originated, current fiscal year, writeoff |  |  | 0
Year three, originated, current fiscal year, writeoff |  |  | 0
Year four, originated, current fiscal year, writeoff |  |  | 0
Year five, originated, current fiscal year, writeoff |  |  | 79
More than five years before current fiscal year, writeoff |  |  | 23
Revolving loans |  |  | 4
Revolving loans converted to term |  |  | 0
Total |  |  | $ 106

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