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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

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