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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
The liability for future policy benefits, after reinsurance recoverable | ¥ 1,304,059 | ¥ 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 | 0 | 125 | 21,353
Effect of actual variances from expected experience | 0 | 2,495 | 2,351
Adjusted beginning balance | 865,333 | 875,193 | 867,596
Issuances | 30,127 | 76,519 | 82,105
Interests | 5,513 | 11,715 | 12,490
Net premium earned | (46,315) | (101,554) | (96,605)
Actual variances from cash flow assumptions | (237) | (385) | (299)
Derecognition | 3,091 | 3,845 | 7,285
Effect of changes in foreign exchange rate | 0 | 0 | 0
Ending balance at original discount rate | 857,512 | 865,333 | 872,572
Effect of changes in discount rates | 12,008 | 29,204 | 54,338
Ending balances | 869,520 | 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 | 0 | 1,506 | 22,525
Adjusted beginning balances | 1,598,009 | 1,536,524 | 1,460,121
Issuances | 30,127 | 76,519 | 82,105
Interests | 11,996 | 24,023 | 23,867
Insurance claims paid | (24,340) | (45,075) | (42,897)
Actual variances from cash flow assumptions | (7,436) | (12,376) | (12,698)
Derecognition | 10,943 | 18,394 | 24,520
Effect of changes in foreign exchange rate | 0 | 0 | 0
Ending balances at original discount rate | 1,619,299 | 1,598,009 | 1,535,018
Effect of changes in discount rates | (94,265) | (26,123) | 56,250
Ending balance | 1,525,034 | 1,571,886 | 1,591,268
Net liability for future policy benefits | 655,514 | 677,349 | 664,358
Deferred profit liabilities | 39,815 | 35,770 | 26,173
Subtotal | 695,329 | 713,119 | 690,531
Less: Reinsurance recoverable | 132 | 215 | 210
The liability for future policy benefits, after reinsurance recoverable | 695,197 | 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 | 0 | 48,389 | 28,690
Effect of actual variances from expected experience | 0 | 22,851 | 1,414
Adjusted beginning balance | 1,338,398 | 1,356,617 | 1,291,286
Issuances | 28,481 | 83,982 | 86,304
Interests | 9,360 | 18,762 | 19,412
Net premium earned | (59,561) | (117,670) | (114,874)
Actual variances from cash flow assumptions | (439) | (710) | (652)
Derecognition | (1,957) | (2,583) | 3,901
Effect of changes in foreign exchange rate | 0 | 0 | 0
Ending balance at original discount rate | 1,314,282 | 1,338,398 | 1,285,377
Effect of changes in discount rates | 13,733 | 50,665 | 95,576
Ending balances | 1,328,015 | 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 | 0 | 53,098 | 29,515
Adjusted beginning balances | 1,887,744 | 1,847,089 | 1,738,372
Issuances | 28,481 | 83,982 | 86,304
Interests | 14,123 | 27,839 | 27,677
Insurance claims paid | (35,369) | (96,364) | (65,052)
Actual variances from cash flow assumptions | (3,485) | 20,178 | (6,083)
Derecognition | 1,328 | 5,020 | 12,773
Effect of changes in foreign exchange rate | 0 | 0 | 0
Ending balances at original discount rate | 1,892,822 | 1,887,744 | 1,793,991
Effect of changes in discount rates | (53,678) | 30,718 | 128,012
Ending balance | 1,839,144 | 1,918,462 | 1,922,003
Net liability for future policy benefits | 511,129 | 529,399 | 541,050
Deferred profit liabilities | 66,255 | 61,668 | 54,801
Subtotal | 577,384 | 591,067 | 595,851
Less: Reinsurance recoverable | 0 | 0 | 0
The liability for future policy benefits, after reinsurance recoverable | 577,384 | 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 | 0 | (6,975) | 662
Effect of actual variances from expected experience | 0 | (1,957) | (209)
Adjusted beginning balance | 409,847 | 429,147 | 356,288
Issuances | 22,366 | 22,660 | 77,532
Interests | 5,782 | 10,966 | 9,263
Net premium earned | (33,580) | (60,198) | (49,290)
Actual variances from cash flow assumptions | (656) | (1,274) | (8)
Derecognition | (14,744) | (33,441) | 2,610
Effect of changes in foreign exchange rate | 49,340 | 41,987 | 41,684
Ending balance at original discount rate | 438,355 | 409,847 | 438,079
Effect of changes in discount rates | (50,253) | (34,896) | (15,326)
Ending balances | 388,102 | 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 | 0 | (6,296) | 626
Adjusted beginning balances | 573,616 | 537,208 | 403,178
Issuances | 22,366 | 22,660 | 77,532
Interests | 8,163 | 14,552 | 11,125
Insurance claims paid | (7,666) | (13,370) | (1,631)
Actual variances from cash flow assumptions | 4,416 | 9,002 | (329)
Derecognition | (21,716) | (47,189) | 2,533
Effect of changes in foreign exchange rate | 70,615 | 50,753 | 51,096
Ending balances at original discount rate | 649,794 | 573,616 | 543,504
Effect of changes in discount rates | (252,809) | (186,543) | (106,040)
Ending balance | 396,985 | 387,073 | 437,464
Net liability for future policy benefits | 8,883 | 12,122 | 14,711
Deferred profit liabilities | 22,595 | 15,578 | 7,573
Subtotal | 31,478 | 27,700 | 22,284
Less: Reinsurance recoverable | 0 | 0 | 0
The liability for future policy benefits, after reinsurance recoverable | ¥ 31,478 | ¥ 27,700 | ¥ 22,284

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