Leasing - Schedule of Ally as the Lessor (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] | ||
| Vehicles | $ 10,131 | $ 10,163 |
| Accumulated depreciation | (1,432) | (1,391) |
| Investment in operating leases, net | $ 8,699 | 8,772 |
| 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 | $ 3,400 | $ 3,400 |
| 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 Residual Value Guarantee No definition available.
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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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Amount, before accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Amount, after accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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