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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, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Interest rate swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | ¥ (2,226) | ¥ (5,090) | ¥ 23,838
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 | 0 |
Interest rate swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | (446) | (114) | 175
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 | 2,179 | (57) | (184)
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 | 0 |
Foreign exchange contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 694 | 0 | (893)
Foreign exchange contracts | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 0 | 0 | 893
Foreign currency swap agreements |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (10,239) | 2,733 | (2,268)
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 | 0 |
Foreign currency swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 2,977 | 2,521 | 766
Foreign currency swap agreements | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) reclassified from other comprehensive income (loss) into income | 8,262 | (6,299) | 905
Options held/written and other |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other comprehensive income on derivative | (8,059) | (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 | 14 | 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 | 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 | ¥ 0

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