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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, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance costs | ¥ (398,916) | ¥ (368,140) | ¥ (374,348)
Gains on sales of subsidiaries and affiliates and liquidation losses, net | 26,915 | 187,787 | 23,300
Write-downs of securities and other | (824) | (730) | (5,935)
Interest expense | (127,618) | (68,232) | (78,068)
Income tax (expense) or benefit | (87,500) | (187,264) | (90,747)
Net Income | 279,668 | 317,612 | 196,814
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 | 511 | 4,268 | 504
Income tax (expense) or benefit | (90) | (61) | (510)
Net Income | 421 | 4,207 | (6)
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 | 155 | 4,619 | 2,473
Life insurance premiums and related investment income | (765) | 737 | 5,433
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 | 509 | 92 | (1,468)
Life insurance premiums and related investment income | 1,148 | (658) | (1,340)
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) | (4,594)
Reclassification adjustment included in net income | Debt valuation adjustments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Life insurance costs | 18 | 36 | 101
Total before income tax | 18 | 36 | 101
Income tax (expense) or benefit | (5) | (10) | (28)
Net Income | 13 | 26 | 73
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 | 376 | 386 | 447
Amortization of net actuarial loss | (88) | (912) | (1,633)
Amortization of transition obligation | (1) | (1) | (1)
Total before income tax | 287 | (527) | (1,187)
Income tax (expense) or benefit | (76) | 151 | 368
Net Income | 211 | (376) | (819)
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 affiliates and liquidation losses, net | 8,776 | 873 | (2,760)
Total before income tax | (5,897) | (909) | (4,817)
Income tax (expense) or benefit | 1,806 | 295 | 751
Net Income | (4,091) | (614) | (4,066)
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 affiliates and liquidation losses, net/Interest expense/Other (income) and expense, net | (14,673) | (1,782) | (2,057)
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 | (1,846) | (5,914) | (7,702)
Income tax (expense) or benefit | 408 | 1,478 | 1,923
Net Income | (1,438) | (4,436) | (5,779)
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 | (175) | (1,615) | (1,522)
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) | (242)
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 | ¥ (1,671) | ¥ (3,589) | ¥ (5,938)

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