Income Taxes (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Jul. 04, 2025 |
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| Income Tax Disclosure [Abstract] | |||||
| QCCV tax credits | $ 236 | $ 236 | |||
| Effective income tax rate (percentage) | 0.60% | 24.50% | 18.20% | 27.20% | |
| Deferred tax liabilities | $ 680 | ||||
| Accumulated undistributed earnings of HCFI | $ 1,000 | $ 1,000 | |||
| Unrecognized deferred tax liability from undistributed foreign earnings | $ 105 | $ 105 | |||
| X | ||||||||||
- Definition Deferred Qualified Commercial Clean Vehicles Tax Credit No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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