Liabilities for Quality Assurance - Summary of Net Changes in Liabilities for Recalls and Other Safety Measures (Detail) ¥ in Millions	12 Months Ended
Mar. 31, 2026 JPY (¥)
Liabilities for recalls and other safety measures [Abstract]
Liabilities for recalls and other safety measures at beginning of year	¥ 1,236,465
Additional provisions	844,899
Utilization	(611,331)
Reversals	(8,562)
Unwinding of discount and effect of change in discount rate	38,722
Other	(69,081)
Liabilities for recalls and other safety measures at end of year	¥ 1,431,112

Decrease in liabilities for recalls and other safety measures by reversal.

No definition available.

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Decrease in liabilities for recalls and other safety measures by utilization.

No definition available.

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Increase decrease in liabilities for recalls and other safety measures by other changes.

No definition available.

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Increase decrease in liabilities for recalls and other safety measures by unwinding of discount and changes in discount rate.

No definition available.

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Increase in liabilities for recalls and other safety measures.

No definition available.

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Liabilities for recalls and other safety measures

No definition available.

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No definition available.

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