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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Deferred Policy Acquisition Costs (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | ¥ 287,379 | ¥ 268,960
Capitalization | 30,260 | 31,202
Amortization | (18,172) | (16,320)
Effect of changes in foreign exchange rate | 6,267 | 3,537
Ending balance | 305,734 | 287,379
Yen-denominated insurance (First Sector) |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | 77,957 | 74,676
Capitalization | 10,285 | 8,682
Amortization | (5,901) | (5,401)
Effect of changes in foreign exchange rate | 0 | 0
Ending balance | 82,341 | 77,957
Yen-denominated insurance (Third Sector) |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | 166,696 | 159,041
Capitalization | 12,855 | 16,795
Amortization | (9,970) | (9,140)
Effect of changes in foreign exchange rate | 0 | 0
Ending balance | 169,581 | 166,696
Foreign currency denominated insurance |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | 42,726 | 35,243
Capitalization | 7,120 | 5,725
Amortization | (2,301) | (1,779)
Effect of changes in foreign exchange rate | 6,267 | 3,537
Ending balance | ¥ 53,812 | ¥ 42,726

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