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Leasing - Ally as the Lessee (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
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 | $ 9 | $ 9 | $ 27 | $ 26 |
Right-of-use asset obtained in exchange for operating lease liability |  |  | $ 25 | $ 19 |
Operating lease, weighted-average remaining lease term | 4 years |  | 4 years |  | 3 years
Operating lease, weighted average discount rate | 3.56% |  | 3.56% |  | 3.32%
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease remaining lease term | 7 months |  | 7 months |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease remaining lease term | 11 years |  | 11 years |  |

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- Definition Cash Paid For Amounts Included In The Measurement Of Lease Liabilities + References No definition available. + Details
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- Definition Lessee, Operating Lease, Lease Extension, Maximum + References No definition available. + Details
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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 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: 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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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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