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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance costs ¥ (433,863) ¥ (373,906) ¥ (363,569)
Interest expense (188,328) (127,618) (68,232)
Income tax (expense) or benefit (131,388) (95,245) (186,594)
Net Income 338,587 296,933 322,853
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 (2,089) 511 4,268
Income tax (expense) or benefit 749 (90) (61)
Net Income (1,340) 421 4,207
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 231 155 4,619
Life insurance premiums and related investment income (7,184) (765) 737
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 756 509 92
Life insurance premiums and related investment income 4,108 1,148 (658)
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) (522)
Reclassification adjustment included in net income | Debt valuation adjustments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance costs 19 18 36
Total before income tax 19 18 36
Income tax (expense) or benefit (5) (5) (10)
Net Income 14 13 26
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 438 376 386
Amortization of net actuarial loss (70) (88) (912)
Amortization of transition obligation (1) (1) (1)
Total before income tax 367 287 (527)
Income tax (expense) or benefit (101) (76) 151
Net Income 266 211 (376)
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 109 8,776 873
Total before income tax (14,843) (5,897) (909)
Income tax (expense) or benefit 4,601 1,806 295
Net Income (10,242) (4,091) (614)
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 (14,952) (14,673) (1,782)
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 3,892 (1,846) (5,914)
Income tax (expense) or benefit (945) 408 1,478
Net Income 2,947 (1,438) (4,436)
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 114 (175) (1,615)
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 /Other (income) and expense   0 (710)
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 ¥ 3,778 ¥ (1,671) ¥ (3,589)