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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified to Net Income from Accumulated Other Comprehensive Income (loss)) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance costs ¥ (384,753) ¥ (433,863) ¥ (373,906)
Interest expense (169,051) (188,328) (127,618)
Income tax (expense) or benefit (128,828) (131,388) (95,245)
Net Income 351,635 338,587 296,933
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total before income tax 497 (2,089) 511
Income tax (expense) or benefit 347 749 (90)
Net Income 844 (1,340) 421
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities | Sales of debt securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Gains on investment securities and dividend 1,004 231 155
Life insurance premiums and related investment income (9,010) (7,184) (765)
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities | Amortization of debt securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Finance revenues 1,732 756 509
Life insurance premiums and related investment income 6,771 4,108 1,148
Reclassification adjustment included in net income | Net unrealized gains (losses) on investment in securities | Others      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Write-downs of securities and other     (536)
Reclassification adjustment included in net income | Debt valuation adjustments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance costs 4 19 18
Total before income tax 4 19 18
Income tax (expense) or benefit (1) (5) (5)
Net Income 3 14 13
Reclassification adjustment included in net income | Defined benefit pension plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of prior service credit 394 438 376
Amortization of net actuarial loss 84 (70) (88)
Amortization of transition obligation (1) (1) (1)
Settlements 148    
Total before income tax 625 367 287
Income tax (expense) or benefit (181) (101) (76)
Net Income 444 266 211
Reclassification adjustment included in net income | Foreign currency translation adjustments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Gains on sales of subsidiaries and equity method investments and liquidation losses, net 903 109 8,776
Total before income tax (25,689) (14,843) (5,897)
Income tax (expense) or benefit 7,963 4,601 1,806
Net Income (17,726) (10,242) (4,091)
Reclassification adjustment included in net income | Foreign currency translation adjustments | Foreign exchange contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Gains on sales of subsidiaries and equity method investments and liquidation losses, net/Interest expense/Other (income) and expense (26,592) (14,952) (14,673)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total before income tax (11,501) 3,892 (1,846)
Income tax (expense) or benefit 2,635 (945) 408
Net Income (8,866) 2,947 (1,438)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Interest rate swap agreements      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense 446 114 (175)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Foreign exchange contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense (694)    
Interest expense /Other (income) and expense     0
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Foreign currency swap agreements      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense /Other (income) and expense (11,239) ¥ 3,778 ¥ (1,671)
Reclassification adjustment included in net income | Net unrealized gains (losses) on derivative instruments | Options held/written and other      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance premiums and related investment income ¥ (14)