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Short-Term and Long-Term Debt (Composition of Short-Term Debt and Weighted Average Contract Interest Rate on Short-Term Debt) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 574,095 | ¥ 508,796
Weighted average rate | 3.10% | 3.40%
Secured borrowings on securities lending transactions [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 120,116 |
Weighted average rate | 1.10% |
Unsecured bonds [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 1,122 |
Weighted average rate | 4.70% |
Payables Under Securitized Loan Receivables And Investment In Securities [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 2,186 |
Weighted average rate | 4.00% |
Japan | Bank Borrowings |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 139,450 | ¥ 145,768
Weighted average rate | 0.70% | 1.80%
Japan | Commercial Paper |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 7,998 | ¥ 42,997
Weighted average rate | 0.10% | 0.10%
Overseas | Bank Borrowings |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 297,372 | ¥ 318,519
Weighted average rate | 5.00% | 4.50%
Overseas | Commercial Paper |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 5,851 | ¥ 1,512
Weighted average rate | 2.70% | 4.10%

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