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Equity Method Investments (Summary of Equity Method Investments) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity method investments	¥ 1,313,887	¥ 1,062,410
Investment in corporate entities [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,002,560	838,787
Investment in real estate joint ventures [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	124,537	110,388
Investment in partnerships and other investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	¥ 186,790	¥ 113,235

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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