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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Other comprehensive income (loss), net of tax | ¥ 206,038 | ¥ 135,693 | ¥ 138,921
Net income (loss), including portion attributable to noncontrolling interest | 338,587 | 296,933 | 322,853
Income tax expense (benefit) | 131,388 | 95,245 | 186,594
Net unrealized gains (losses) on investments |  | 0 |
Revision of Prior Period, Adjustment | Accounting Standards Update 2018-12 [Member] |  |  |
Net unrealized gains (losses), tax |  |  | 4,296
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
Other comprehensive income (loss), net of tax |  | (24,641) |
Other comprehensive income (loss), tax |  | 4,296 |
Net income (loss), including portion attributable to noncontrolling interest |  | 189,157 |
Income tax expense (benefit) |  | (66,702) |
Net unrealized gains (losses) on investment in securities |  |  |
Net unrealized gains (losses), tax | 27,906 | 41,871 | 21,836
Reclassification adjustment included in net income, tax | (749) | 90 | 61
Other comprehensive income (loss), net of tax | (67,762) | (110,166) | (56,684)
Net unrealized gains (losses) on investments | (82) |  |
Net unrealized gains (losses) on investments, net of tax | 16 |  |
Impact of changes in policy liability discount rate |  |  |
Net unrealized gains (losses), tax | (32,471) | (43,576) | (23,126)
Other comprehensive income (loss), net of tax | 93,269 | 126,980 | 62,177
Debt valuation adjustments |  |  |
Net unrealized gains (losses), tax | 69 | (25) | 121
Reclassification adjustment included in net income, tax | 5 | 5 | 10
Other comprehensive income (loss), net of tax | (191) | 54 | (337)
Defined benefit pension plans |  |  |
Net unrealized gains (losses), tax | (5,655) | (1,706) | (4,738)
Reclassification adjustment included in net income, tax | 101 | 76 | (151)
Other comprehensive income (loss), net of tax | 13,293 | 4,448 | 13,002
Foreign currency translation adjustments |  |  |
Net unrealized gains (losses), tax | 35,593 | 19,131 | 17,642
Reclassification adjustment included in net income, tax | (4,601) | (1,806) | (295)
Other comprehensive income (loss), net of tax | 173,304 | 94,707 | 105,693
Net unrealized gains (losses) on derivative instruments |  |  |
Net unrealized gains (losses), tax | 578 | (3,106) | (3,256)
Reclassification adjustment included in net income, tax | ¥ 945 | ¥ (408) | ¥ (1,478)

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