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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Reconciliation of Liability For Future Policy Benefits (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
The liability for future policy benefits, after reinsurance recoverable ¥ 1,430,462 ¥ 1,331,671 ¥ 1,308,456
Yen-denominated insurance (First Sector)      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance at beginning of year 894,537 926,910 909,868
Beginning balance at original discount rate 865,333 872,572 843,892
Effect of changes in cash flow assumptions (6,213) 126 21,353
Effect of actual variances from expected experience 1,418 2,495 2,351
Adjusted beginning balance 860,538 875,193 867,596
Issuances 94,169 76,519 82,105
Interests 10,840 11,715 12,490
Net premium earned (106,300) (101,554) (96,605)
Actual variances from cash flow assumptions (550) (385) (299)
Derecognition 262 3,845 7,285
Effect of changes in foreign exchange rate 0 0 0
Ending balance at original discount rate 858,959 865,333 872,572
Effect of changes in discount rates 14,079 29,204 54,338
Ending balances 873,038 894,537 926,910
Balances at beginning of year 1,571,886 1,591,268 1,526,258
Beginning balance at original discount rate 1,598,009 1,535,018 1,437,596
Effect of changes in cash flow assumptions (7,962) 1,506 22,525
Adjusted beginning balances 1,590,047 1,536,524 1,460,121
Issuances 94,169 76,519 82,105
Interests 23,981 24,023 23,867
Insurance claims paid (52,161) (45,075) (42,897)
Actual variances from cash flow assumptions (11,644) (12,376) (12,698)
Derecognition 13,751 18,394 24,520
Effect of changes in foreign exchange rate 0 0 0
Ending balances at original discount rate 1,658,143 1,598,009 1,535,018
Effect of changes in discount rates (92,266) (26,123) 56,250
Ending balance 1,565,877 1,571,886 1,591,268
Net liability for future policy benefits 692,839 677,349 664,358
Deferred profit liabilities 47,068 35,770 26,173
Subtotal 739,907 713,119 690,531
Less: Reinsurance recoverable 211 215 210
The liability for future policy benefits, after reinsurance recoverable 739,696 712,904 690,321
Yen-denominated insurance (Third Sector)      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance at beginning of year 1,389,063 1,380,953 1,377,265
Beginning balance at original discount rate 1,338,398 1,285,377 1,261,182
Effect of changes in cash flow assumptions 3,634 48,389 28,690
Effect of actual variances from expected experience 2,865 22,851 1,414
Adjusted beginning balance 1,344,897 1,356,617 1,291,286
Issuances 52,510 83,982 86,304
Interests 18,439 18,762 19,412
Net premium earned (119,416) (117,670) (114,874)
Actual variances from cash flow assumptions (862) (710) (652)
Derecognition (6,423) (2,583) 3,901
Effect of changes in foreign exchange rate 0 0 0
Ending balance at original discount rate 1,289,145 1,338,398 1,285,377
Effect of changes in discount rates 17,574 50,665 95,576
Ending balances 1,306,719 1,389,063 1,380,953
Balances at beginning of year 1,918,462 1,922,003 1,877,906
Beginning balance at original discount rate 1,887,744 1,793,991 1,708,857
Effect of changes in cash flow assumptions 4,600 53,098 29,515
Adjusted beginning balances 1,892,344 1,847,089 1,738,372
Issuances 52,510 83,982 86,304
Interests 28,159 27,839 27,677
Insurance claims paid (70,513) (96,364) (65,052)
Actual variances from cash flow assumptions (7,465) 20,178 (6,083)
Derecognition 695 5,020 12,773
Effect of changes in foreign exchange rate 0 0 0
Ending balances at original discount rate 1,895,730 1,887,744 1,793,991
Effect of changes in discount rates (51,131) 30,718 128,012
Ending balance 1,844,599 1,918,462 1,922,003
Net liability for future policy benefits 537,880 529,399 541,050
Deferred profit liabilities 68,539 61,668 54,801
Subtotal 606,419 591,067 595,851
Less: Reinsurance recoverable 0 0 0
The liability for future policy benefits, after reinsurance recoverable 606,419 591,067 595,851
Foreign currency denominated insurance      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance at beginning of year 374,951 422,753 366,081
Beginning balance at original discount rate 409,847 438,079 355,835
Effect of changes in cash flow assumptions 2,106 (6,975) 662
Effect of actual variances from expected experience (2,531) (1,957) (209)
Adjusted beginning balance 409,422 429,147 356,288
Issuances 43,378 22,660 77,532
Interests 12,405 10,966 9,263
Net premium earned (61,594) (60,198) (49,290)
Actual variances from cash flow assumptions (1,222) (1,274) (8)
Derecognition (32,681) (33,441) 2,610
Effect of changes in foreign exchange rate 54,478 41,987 41,684
Ending balance at original discount rate 424,186 409,847 438,079
Effect of changes in discount rates (34,522) (34,896) (15,326)
Ending balances 389,664 374,951 422,753
Balances at beginning of year 387,073 437,464 366,081
Beginning balance at original discount rate 573,616 543,504 402,552
Effect of changes in cash flow assumptions 1,782 (6,296) 626
Adjusted beginning balances 575,398 537,208 403,178
Issuances 43,378 22,660 77,532
Interests 17,649 14,552 11,125
Insurance claims paid (17,757) (13,370) (1,631)
Actual variances from cash flow assumptions 11,794 9,002 (329)
Derecognition (49,973) (47,189) 2,533
Effect of changes in foreign exchange rate 78,728 50,753 51,096
Ending balances at original discount rate 659,217 573,616 543,504
Effect of changes in discount rates (212,136) (186,543) (106,040)
Ending balance 447,081 387,073 437,464
Net liability for future policy benefits 57,417 12,122 14,711
Deferred profit liabilities 26,930 15,578 7,573
Subtotal 84,347 27,700 22,284
Less: Reinsurance recoverable 0 0 0
The liability for future policy benefits, after reinsurance recoverable ¥ 84,347 ¥ 27,700 ¥ 22,284