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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%