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Short-Term and Long-Term Debt (Assets Provided as Collateral for Short-Term and Long-Term Debt Payables to Financial Institutions) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Investment in securities | ¥ 3,263,079 | ¥ 2,852,378
Property under facility operations | 689,573 | ¥ 620,994
Asset Pledged as Collateral [Member] |  |
Debt Instrument [Line Items] |  |
Lease payments, loans and investment in operating leases | 310,217 |
Investment in securities | 324,760 |
Property under facility operations | 231,425 |
Other assets and other | 69,740 |
Total | ¥ 936,142 |

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