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Equity Method Investments (Summary of Equity Method Investments) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2024	Mar. 31, 2024
Schedule of Equity Method Investments [Line Items]
Equity method investments	¥ 1,362,461	¥ 1,313,887
Investment in corporate entities
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,036,469	1,002,560
Investment in real estate joint ventures
Schedule of Equity Method Investments [Line Items]
Equity method investments	130,937	124,537
Investment in partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	¥ 195,055	¥ 186,790

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.

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