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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
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.