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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Other Comprehensive Income (Loss), Net of Tax       ¥ 75,139 ¥ 98,522 ¥ 175,943 ¥ 218,869
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest       66,483 61,793 130,640 126,143
Income Tax Expense (Benefit)       28,592 18,767 53,827 39,981
Net unrealized gains (losses) on investments, net of tax       (128) 0 (128) 0
Net unrealized gains (losses) on investments       21   21  
Cumulative Effect, Period of Adoption, Adjusted Balance | Effect of Modified Retrospective Application Accounting Standards Update 2018-12              
Other Comprehensive Income (Loss), Net of Tax ¥ (24,641) ¥ (24,641) ¥ (24,641)        
Other Comprehensive Income (Loss), Tax 4,296 4,296 4,296        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 189,157 139,027 62,176        
Income Tax Expense (Benefit) ¥ (66,702) ¥ (52,893) ¥ (23,125)        
Net unrealized gains (losses) on investment in securities              
Net unrealized gains (losses), tax       36,198 23,591 35,524 54,025
Reclassification adjustment included in net income, tax       353 10 1,211 292
Other Comprehensive Income (Loss), Net of Tax       (99,262) (62,494) (100,412) (143,867)
Impact of changes in policy liability discount rate              
Net unrealized gains (losses), tax       (36,613) (31,968) (38,745) (61,736)
Other Comprehensive Income (Loss), Net of Tax       106,057 82,515 110,576 159,366
Debt valuation adjustments              
Net unrealized gains (losses), tax       30 (31) 43 (25)
Reclassification adjustment included in net income, tax       0 1 3 2
Other Comprehensive Income (Loss), Net of Tax       (79) 76 (123) 60
Defined benefit pension plans              
Net unrealized gains (losses), tax       59 45 (19) 81
Reclassification adjustment included in net income, tax       25 17 52 33
Other Comprehensive Income (Loss), Net of Tax       (236) (151) (89) (316)
Foreign currency translation adjustments              
Net unrealized gains (losses), tax       39 3,827 22,732 27,143
Reclassification adjustment included in net income, tax       (1,014) (3) (2,328) (12)
Other Comprehensive Income (Loss), Net of Tax       64,265 70,976 163,583 185,095
Net unrealized gains (losses) on derivative instruments              
Net unrealized gains (losses), tax       93 (3,069) (2,072) (4,707)
Reclassification adjustment included in net income, tax       ¥ (169) ¥ 399 ¥ 1,289 ¥ (436)