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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Cash flow hedges) (Detail) - Derivatives designated as hedging instruments - Cash flow hedges - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Interest rate swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | ¥ (5,090) | ¥ 23,838 | ¥ 16,507
Interest rate swap agreements | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 |  |
Interest rate swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (114) | 175 | 1,615
Interest rate swap agreements | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0 | 0
Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (57) | (184) | (542)
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 |  |
Foreign exchange contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | (893) | 223
Foreign exchange contracts | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 893 | 487
Foreign currency swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | 2,733 | (2,268) | (2,075)
Foreign currency swap agreements | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 |  |
Foreign currency swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 2,521 | 766 | 559
Foreign currency swap agreements | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (6,299) | 905 | ¥ 3,030
Options held/written and other |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (1,092) | (48) |
Options held/written and other | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 |  |
Options held/written and other | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0 |
Options held/written and other | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | ¥ 0 | ¥ 0 |

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