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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income ¥ 456,924 ¥ 448,676 ¥ 427,347
Liability for Future Policy Benefit, Interest Expense 28,105 24,971 21,503
Yen-denominated insurance (First Sector)      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income 168,805 162,667 158,477
Liability for Future Policy Benefit, Interest Expense 13,142 12,309 11,376
Yen-denominated insurance (Third Sector)      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income 205,787 208,640 207,553
Liability for Future Policy Benefit, Interest Expense 9,720 9,077 8,265
Foreign currency denominated insurance      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Gross Premium Income 82,332 77,369 61,317
Liability for Future Policy Benefit, Interest Expense ¥ 5,243 ¥ 3,585 ¥ 1,862