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Equity Method Investments (Summary of Equity Method Investments) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | ¥ 1,320,015 | ¥ 1,313,887
Investment in corporate entities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 973,795 | 1,002,560
Investment in real estate joint ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 137,274 | 124,537
Investment in partnerships and other investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | ¥ 208,946 | ¥ 186,790

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