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Leasing (Ally as the Lessee) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Lessee, Lease, Description [Line Items] |  |  |
Noncancelable lease term | 367 days |  |
Lease extension, maximum | 48 months |  |
Cash paid for amounts included in the measurement of lease liabilities | $ 8 | $ 8 |
Right-of-use asset obtained in exchange for operating lease liability | $ 16 |  |
Operating lease, weighted-average remaining lease term | 4 years |  | 4 years
Operating lease, weighted average discount rate | 3.12% |  | 2.85%
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease remaining lease term | 2 months |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease remaining lease term | 7 years |  |

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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 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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