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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)