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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Gross Premiums And Interest Expense (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income ¥ 471,859 ¥ 456,924 ¥ 448,676
Liability for Future Policy Benefit, Interest Expense 31,466 28,105 24,971
Yen-denominated insurance (First Sector)      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income 184,650 168,805 162,667
Liability for Future Policy Benefit, Interest Expense 13,895 13,142 12,309
Yen-denominated insurance (Third Sector)      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income 199,809 205,787 208,640
Liability for Future Policy Benefit, Interest Expense 10,509 9,720 9,077
Foreign currency denominated insurance      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income 87,400 82,332 77,369
Liability for Future Policy Benefit, Interest Expense ¥ 7,062 ¥ 5,243 ¥ 3,585