Income Taxes - Schedule of Composition of Income Tax Expense (Benefit) (Details) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income taxes paid (refund) [abstract]
Current tax expense	¥ 110,804	¥ 138,057	¥ 107,349
Deferred tax benefit	(101,034)	(71,116)	(198,755)
Total	¥ 9,770	¥ 66,941	¥ (91,406)

- References

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+ Details