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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Beginning Balance | ¥ 3,614,322 | ¥ 3,414,178 | ¥ 3,103,144
Total other comprehensive income (loss) | 206,038 | 135,693 | 138,921
Ending Balance | 4,021,965 | 3,614,322 | 3,414,178
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | 3,078,718
Net unrealized gains (losses) on investment in securities |  |  |
Beginning Balance | (183,034) | (72,892) | (16,208)
Net unrealized gains (losses) | (69,102) | (109,745) | (52,477)
Reclassification adjustment included in net income, net of tax | 1,340 | (421) | (4,207)
Total other comprehensive income (loss) | (67,762) | (110,166) | (56,684)
Transaction with noncontrolling interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 10 | (24) |
Ending Balance | (250,806) | (183,034) | (72,892)
Net unrealized gains (losses) on investment in securities | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | (16,208)
Impact of changes in policy liability discount rate |  |  |
Beginning Balance | 164,516 | 37,536 |
Net unrealized gains (losses) | 93,269 | 126,980 | 62,177
Total other comprehensive income (loss) | 93,269 | 126,980 | 62,177
Transaction with noncontrolling interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 | 0 |
Ending Balance | 257,785 | 164,516 | 37,536
Impact of changes in policy liability discount rate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | (24,641)
Impact of changes in policy liability discount rate | Accounting Standards Update 2018-12 | Revision of Prior Period, Adjustment |  |  |
Beginning Balance |  |  | (24,641)
Debt Valuation Adjustments |  |  |
Beginning Balance | 275 | 221 | 558
Net unrealized gains (losses) | (177) | 67 | (311)
Reclassification adjustment included in net income, net of tax | (14) | (13) | (26)
Total other comprehensive income (loss) | (191) | 54 | (337)
Transaction with noncontrolling interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 | 0 |
Ending Balance | 84 | 275 | 221
Debt Valuation Adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | 558
Defined benefit pension plans |  |  |
Beginning Balance | (3,617) | (8,072) | (21,073)
Net unrealized gains (losses) | 13,559 | 4,659 | 12,626
Reclassification adjustment included in net income, net of tax | (266) | (211) | 376
Total other comprehensive income (loss) | 13,293 | 4,448 | 13,002
Transaction with noncontrolling interests | 0 | 0 | 0
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 6 | (7) | 1
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 | 0 |
Ending Balance | 9,670 | (3,617) | (8,072)
Defined benefit pension plans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | (21,073)
Foreign currency translation adjustments |  |  |
Beginning Balance | 155,912 | 61,914 | (36,456)
Net unrealized gains (losses) | 163,062 | 90,616 | 105,079
Reclassification adjustment included in net income, net of tax | 10,242 | 4,091 | 614
Total other comprehensive income (loss) | 173,304 | 94,707 | 105,693
Transaction with noncontrolling interests | 11 | 2,903 | (1,472)
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 4,816 | 3,637 | 5,851
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 203 | (25) |
Ending Balance | 324,208 | 155,912 | 61,914
Foreign currency translation adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | (36,456)
Net unrealized gains (losses) on derivative instruments |  |  |
Beginning Balance | 22,083 | 2,788 | (11,471)
Net unrealized gains (losses) | (2,928) | 18,232 | 10,634
Reclassification adjustment included in net income, net of tax | (2,947) | 1,438 | 4,436
Total other comprehensive income (loss) | (5,875) | 19,670 | 15,070
Transaction with noncontrolling interests | (176) | 1,493 | (3)
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | (175) | 1,868 | 808
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 | 0 |
Ending Balance | 16,207 | 22,083 | 2,788
Net unrealized gains (losses) on derivative instruments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | (11,471)
AOCI Attributable to Parent |  |  |
Beginning Balance | 156,135 | 21,495 | (84,650)
Total other comprehensive income (loss) | 206,038 | 135,693 | 138,921
Transaction with noncontrolling interests | (165) | 4,396 | (1,475)
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 4,647 | 5,498 | 6,660
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 213 | (49) |
Ending Balance | ¥ 357,148 | ¥ 156,135 | 21,495
AOCI Attributable to Parent | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Beginning Balance |  |  | (109,291)
AOCI Attributable to Parent | Accounting Standards Update 2018-12 | Revision of Prior Period, Adjustment |  |  |
Beginning Balance |  |  | ¥ (24,641)

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