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Other Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (118) | $ (112)
Net carrying value | 67 |
Total intangible assets, gross | 185 | 185
Net intangible assets | 67 | 73
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Ally Lending |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross intangible assets |  | 22
Accumulated amortization |  | 22
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross intangible assets | 117 | 117
Accumulated amortization | (68) | (64)
Net carrying value | 49 | 53
Customer lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross intangible assets | 41 | 41
Accumulated amortization | (40) | (39)
Net carrying value | 1 | 2
Purchased credit card relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross intangible assets | 25 | 25
Accumulated amortization | (8) | (7)
Net carrying value | 17 | 18
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross intangible assets | 2 | 2
Accumulated amortization | (2) | (2)
Net carrying value | $ 0 | $ 0

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