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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Statement [Line Items]      
Beginning Balance ¥ 3,371,401 ¥ 3,103,144 ¥ 3,065,835
Total other comprehensive income (loss) 8,713 76,744 34,277
Ending Balance 3,427,300 3,371,401 3,103,144
Net unrealized gains (losses) on investment in securities      
Statement [Line Items]      
Beginning Balance (72,892) (16,208) (5,001)
Net unrealized gains (losses) (109,745) (52,477) (11,188)
Reclassification adjustment included in net income, net of tax (421) (4,207) 6
Total other comprehensive income (loss) (110,166) (56,684) (11,182)
Transaction with noncontrolling interests 0 0  
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests 0 0 25
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests (24)   0
Ending Balance (183,034) (72,892) (16,208)
Debt Valuation Adjustments      
Statement [Line Items]      
Beginning Balance 221 558 1,457
Net unrealized gains (losses) 67 (311) (826)
Reclassification adjustment included in net income, net of tax (13) (26) (73)
Total other comprehensive income (loss) 54 (337) (899)
Transaction with noncontrolling interests 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 275 221 558
Defined benefit pension plans      
Statement [Line Items]      
Beginning Balance (8,072) (21,073) (26,375)
Net unrealized gains (losses) 4,659 12,626 4,511
Reclassification adjustment included in net income, net of tax (211) 376 819
Total other comprehensive income (loss) 4,448 13,002 5,330
Transaction with noncontrolling interests 0 0  
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests (7) 1 28
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests 0   0
Ending Balance (3,617) (8,072) (21,073)
Foreign currency translation adjustments      
Statement [Line Items]      
Beginning Balance 61,914 (36,456) (72,471)
Net unrealized gains (losses) 90,616 105,079 32,180
Reclassification adjustment included in net income, net of tax 4,091 614 4,066
Total other comprehensive income (loss) 94,707 105,693 36,246
Transaction with noncontrolling interests 2,903 (1,472)  
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests 3,637 5,851 511
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests (25)   (280)
Ending Balance 155,912 61,914 (36,456)
Net unrealized gains (losses) on derivative instruments      
Statement [Line Items]      
Beginning Balance 2,788 (11,471) (16,142)
Net unrealized gains (losses) 18,232 10,634 (997)
Reclassification adjustment included in net income, net of tax 1,438 4,436 5,779
Total other comprehensive income (loss) 19,670 15,070 4,782
Transaction with noncontrolling interests 1,493 (3)  
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests 1,868 808 111
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests 0   0
Ending Balance 22,083 2,788 (11,471)
AOCI Attributable to Parent      
Statement [Line Items]      
Beginning Balance (16,041) (84,650) (118,532)
Total other comprehensive income (loss) 8,713 76,744 34,277
Transaction with noncontrolling interests 4,396 (1,475)  
Less: Other Comprehensive Income (Loss) Attributable to the Noncontrolling Interests 5,498 6,660 675
Less: Other Comprehensive Income (Loss) Attributable to the Redeemable Noncontrolling Interests (49)   (280)
Ending Balance ¥ (8,381) ¥ (16,041) ¥ (84,650)