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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefits Including Deferred Profit Liabilities (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Apr. 01, 2021
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at March 31, 2021       ¥ 1,152,694
Yen-denominated insurance (First Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at March 31, 2021       610,877
Balance at April 1, 2021 ¥ 692,839 ¥ 677,349 ¥ 664,358  
Yen-denominated insurance (Third Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at March 31, 2021       493,558
Balance at April 1, 2021 537,880 529,399 541,050  
Foreign currency denominated insurance        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at March 31, 2021       48,259
Balance at April 1, 2021 ¥ 57,417 ¥ 12,122 ¥ 14,711  
Cumulative Effect, Period of Adoption, Adjustment        
Liability for Future Policy Benefit, Activity [Line Items]        
Effect of change in discount rates       28,937
Cumulative Effect, Period of Adoption, Adjustment | Yen-denominated insurance (First Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Effect of change in discount rates       22,686
Cumulative Effect, Period of Adoption, Adjustment | Yen-denominated insurance (Third Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Effect of change in discount rates       52,967
Cumulative Effect, Period of Adoption, Adjustment | Foreign currency denominated insurance        
Liability for Future Policy Benefit, Activity [Line Items]        
Effect of change in discount rates       (46,716)
Cumulative Effect, Period of Adoption, Adjusted Balance        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at April 1, 2021       1,181,631
Cumulative Effect, Period of Adoption, Adjusted Balance | Yen-denominated insurance (First Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at April 1, 2021       633,563
Cumulative Effect, Period of Adoption, Adjusted Balance | Yen-denominated insurance (Third Sector)        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at April 1, 2021       546,525
Cumulative Effect, Period of Adoption, Adjusted Balance | Foreign currency denominated insurance        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance at April 1, 2021       ¥ 1,543