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Held-for-sale Operations - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Provision for credit losses | $ 507 | $ 449 |
Goodwill impairment |  |  | $ 149
Corporate and Other |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Goodwill impairment |  |  | 149
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Ally Lending |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Provision for credit losses |  |  | 16
Net pretax loss |  |  | 133
Additional pretax loss | $ 7 |  |
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Ally Lending | Corporate and Other |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Goodwill impairment |  |  | $ 149

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