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Leasing - Schedule of Ally as the Lessor (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |
Vehicles | $ 9,944 | $ 9,519
Accumulated depreciation | (1,345) | (1,528)
Investment in operating leases, net | $ 8,599 | 7,991
Minimum |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |
Lessor, term of contract | 24 months |
Maximum |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |
Lessor, term of contract | 60 months |
Vehicles |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |
Residual value of leased asset | $ 3,500 | $ 1,900
Vehicles | 50% Of Contract Residual Value |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |
Residual value guarantee, percentage | 50.00% | 50.00%

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- Definition Term of lessor's 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/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-3 + Details
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- Definition Amount of residual asset covered by residual value guarantee under operating lease. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-3 + Details
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- Definition Amount of accumulated depreciation of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481501/840-20-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-13 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Name Accounting Standards Codification -Section 45 -Paragraph 3 -SubTopic 20 -Topic 840 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481532/840-20-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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