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Short-Term and Long-Term Debt (Composition of Long-Term Debt, Weighted Average Contract Interest Rate on Long-Term Debt and Repayment Due Dates) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Debt Instrument [Line Items]    
Long-term Debt ¥ 5,626,376 ¥ 5,209,723
Weighted average rate 2.70% 2.40%
Fixed rate, Banks    
Debt Instrument [Line Items]    
Long-term Debt ¥ 777,366 ¥ 666,764
Weighted average rate 1.60% 1.60%
Minimum maturity date 2025 2025
Maximum maturity date 2083 2083
Floating rate, Banks    
Debt Instrument [Line Items]    
Long-term Debt ¥ 2,587,324 ¥ 2,448,488
Weighted average rate 3.40% 2.80%
Minimum maturity date 2025 2024
Maximum maturity date 2077 2077
Fixed rate, Insurance companies and others    
Debt Instrument [Line Items]    
Long-term Debt ¥ 352,035 ¥ 323,653
Weighted average rate 0.60% 0.80%
Minimum maturity date 2029 2025
Maximum maturity date 2083 2083
Floating rate, Insurance companies and others    
Debt Instrument [Line Items]    
Long-term Debt ¥ 271,029 ¥ 295,625
Weighted average rate 2.40% 2.00%
Minimum maturity date 2029 2026
Maximum maturity date 2077 2077
Unsecured bonds    
Debt Instrument [Line Items]    
Long-term Debt ¥ 1,208,672 ¥ 1,175,087
Weighted average rate 2.00% 2.00%
Minimum maturity date 2026 2024
Maximum maturity date 2081 2081
Unsecured notes under medium-term note program    
Debt Instrument [Line Items]    
Long-term Debt ¥ 272,064 ¥ 149,535
Weighted average rate 3.80% 3.70%
Minimum maturity date 2028 2025
Maximum maturity date 2030 2029
Payables under securitized loan receivables and investment in securities    
Debt Instrument [Line Items]    
Long-term Debt ¥ 157,886 ¥ 150,571
Weighted average rate 6.00% 5.50%
Minimum maturity date 2025 2024
Maximum maturity date 2044 2051