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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Other comprehensive income (loss), net of tax ¥ 206,038 ¥ 135,693 ¥ 138,921
Net income (loss), including portion attributable to noncontrolling interest 338,587 296,933 322,853
Income tax expense (benefit) 131,388 95,245 186,594
Net unrealized gains (losses) on investments   0  
Revision of Prior Period, Adjustment | Accounting Standards Update 2018-12 [Member]      
Net unrealized gains (losses), tax     4,296
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Other comprehensive income (loss), net of tax   (24,641)  
Other comprehensive income (loss), tax   4,296  
Net income (loss), including portion attributable to noncontrolling interest   189,157  
Income tax expense (benefit)   (66,702)  
Net unrealized gains (losses) on investment in securities      
Net unrealized gains (losses), tax 27,906 41,871 21,836
Reclassification adjustment included in net income, tax (749) 90 61
Other comprehensive income (loss), net of tax (67,762) (110,166) (56,684)
Net unrealized gains (losses) on investments (82)    
Net unrealized gains (losses) on investments, net of tax 16    
Impact of changes in policy liability discount rate      
Net unrealized gains (losses), tax (32,471) (43,576) (23,126)
Other comprehensive income (loss), net of tax 93,269 126,980 62,177
Debt valuation adjustments      
Net unrealized gains (losses), tax 69 (25) 121
Reclassification adjustment included in net income, tax 5 5 10
Other comprehensive income (loss), net of tax (191) 54 (337)
Defined benefit pension plans      
Net unrealized gains (losses), tax (5,655) (1,706) (4,738)
Reclassification adjustment included in net income, tax 101 76 (151)
Other comprehensive income (loss), net of tax 13,293 4,448 13,002
Foreign currency translation adjustments      
Net unrealized gains (losses), tax 35,593 19,131 17,642
Reclassification adjustment included in net income, tax (4,601) (1,806) (295)
Other comprehensive income (loss), net of tax 173,304 94,707 105,693
Net unrealized gains (losses) on derivative instruments      
Net unrealized gains (losses), tax 578 (3,106) (3,256)
Reclassification adjustment included in net income, tax ¥ 945 ¥ (408) ¥ (1,478)