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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 | Sep. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Apr. 01, 2021
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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 | ¥ 655,514 | ¥ 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 | 511,129 | 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 | ¥ 8,883 | ¥ 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

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- Definition Acccumulated other comprehensive income liability for future policy benefit including deferred profit liabilities after transition to new accounting policy. + References No definition available. + Details
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- Definition Liability for future policy benefits including deferred profit liabilities after impact of change in discount rate after transition to new accounting policy. + References No definition available. + Details
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