Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Millions |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2024 |
[1] | |||
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| Other Assets [Abstract] | |||||||
| Accrued interest and fees on finance receivables | $ 191 | $ 186 | |||||
| Accrued lease payments and fees on operating leases | 76 | 72 | |||||
| Vehicles held for disposition | 134 | 133 | |||||
| Restricted cash | 704 | [1] | 715 | $ 757 | |||
| Operating lease right-of-use assets | 45 | 46 | |||||
| Other miscellaneous assets | 111 | 118 | |||||
| Total | $ 1,261 | $ 1,270 | |||||
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Total | Total | |||||
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- Definition Financing Receivable, Accrued Interest And Fees, After Allowance For Credit Loss No definition available.
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| X | ||||||||||
- Definition Operating Lease, Accrued Lease Payments And Fees No definition available.
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| X | ||||||||||
- Definition Vehicles held for disposition consist of returned and repossessed vehicles. The vehicles are either sold at used vehicle auctions or purchased by dealers, usually within two months of return or repossession. The vehicles are valued at the lower of their carrying value or estimated fair value, less estimated disposition costs. No definition available.
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| X | ||||||||||
- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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| X | ||||||||||
- Definition Amount of other miscellaneous assets. No definition available.
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| X | ||||||||||
- Definition Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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