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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | ¥ 4,171,783 |  | ¥ 4,021,965 |
Total other comprehensive income (loss) | 217,046 |  | (124,378) |
Ending Balance | 4,521,858 |  | 3,978,907 |
Net unrealized gains (losses) on investment in securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (403,914) |  | (250,806) |
Net unrealized gains (losses) | (83,351) |  | (51,324) |
Reclassification adjustment included in net income, net of tax | (4,714) |  | (3,432) |
Total other comprehensive income (loss) | (88,065) |  | (54,756) |
Transaction with noncontrolling interests | 0 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 0 |  | 0 |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | (6) |  | (12) |
Ending Balance | (491,973) | [1] | (305,550) | [2]
Impact of changes in policy liability discount rate |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 416,124 |  | 257,785 |
Net unrealized gains (losses) | 311,459 |  | 2,741 |
Total other comprehensive income (loss) | 311,459 |  | 2,741 |
Transaction with noncontrolling interests | 0 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 0 |  | 0 |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 |  | 0 |
Ending Balance | 727,583 | [1] | 260,526 | [2]
Debt Valuation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 49 |  | 84 |
Net unrealized gains (losses) | 192 |  | (74) |
Reclassification adjustment included in net income, net of tax | (4) |  | (1) |
Total other comprehensive income (loss) | 188 |  | (75) |
Transaction with noncontrolling interests | 0 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | 0 |  | 0 |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 |  | 0 |
Ending Balance | 237 | [1] | 9 | [2]
Defined benefit pension plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 14,791 |  | 9,670 |
Net unrealized gains (losses) | 5,716 |  | (352) |
Reclassification adjustment included in net income, net of tax | (171) |  | (174) |
Total other comprehensive income (loss) | 5,545 |  | (526) |
Transaction with noncontrolling interests | 0 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | (3) |  | (1) |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 |  | 0 |
Ending Balance | 20,339 | [1] | 9,145 | [2]
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 304,657 |  | 324,208 |
Net unrealized gains (losses) | 1,701 |  | (68,723) |
Reclassification adjustment included in net income, net of tax | (6,689) |  | 5,190 |
Total other comprehensive income (loss) | (4,988) |  | (63,533) |
Transaction with noncontrolling interests | 28 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | (614) |  | (1,153) |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 402 |  | (157) |
Ending Balance | 299,909 | [1] | 261,985 | [2]
Net unrealized gains (losses) on derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 9,591 |  | 16,207 |
Net unrealized gains (losses) | (3,585) |  | (13,062) |
Reclassification adjustment included in net income, net of tax | (3,508) |  | 4,833 |
Total other comprehensive income (loss) | (7,093) |  | (8,229) |
Transaction with noncontrolling interests | 0 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | (31) |  | (5) |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 0 |  | 0 |
Ending Balance | 2,529 | [1] | 7,983 | [2]
AOCI Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 341,298 |  | 357,148 |
Total other comprehensive income (loss) | 217,046 |  | (124,378) |
Transaction with noncontrolling interests | 28 |  |  |
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests | (648) |  | (1,159) |
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests | 396 |  | (169) |
Ending Balance | ¥ 558,624 | [1] | ¥ 234,098 | [2]
[1] | As of September 30, 2025, net unrealized gains (losses) on investment in securities contained ¥(186) million (net of tax of ¥28 million ) of net unrealized gains (losses) on investment in securities related to available-for-sale debt securities with allowance for credit losses.
[2] | As of September 30, 2024, net unrealized gains (losses) on investment in securities contained ¥(39) million (net of tax of ¥15 million ) of net unrealized gains (losses) on investment in securities related to available-for-sale debt securities with allowance for credit losses.

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