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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, 2023 | Mar. 31, 2022
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 508,796 | ¥ 439,639
Weighted average rate | 3.40% | 1.40%
Japan | Bank Borrowings |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 145,768 | ¥ 161,799
Weighted average rate | 1.80% | 0.70%
Japan | Commercial Paper |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 42,997 | ¥ 37,999
Weighted average rate | 0.10% | 0.00%
Overseas | Bank Borrowings |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 318,519 | ¥ 237,790
Weighted average rate | 4.50% | 2.10%
Overseas | Commercial Paper |  |
Short-term Debt [Line Items] |  |
Short-term debt | ¥ 1,512 | ¥ 2,051
Weighted average rate | 4.10% | 1.00%

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