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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Fair value hedges) (Detail) - Derivatives designated as hedging instruments - Fair value hedges - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Interest rate swap agreements | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | ¥ 2,633 | ¥ 4,142 | ¥ 9,533
Gains (losses) recognized in income on hedged item | (2,499) | (4,068) | (8,990)
Interest rate swap agreements | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | 0 | 0 | 0
Gains (losses) recognized in income on hedged item | 0 | 0 | 0
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | (42,947) | (37,997) | (5,032)
Gains (losses) recognized in income on hedged item | 43,006 | 37,659 | 3,591
Foreign exchange contracts | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | (412) | 5 | 438
Gains (losses) recognized in income on hedged item | ¥ 332 | ¥ 89 | ¥ (356)

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- Definition Gains (losses) recognized in income on derivative and other. + References No definition available. + Details
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- Definition Hedged Items, Gain (Loss) Recognized in Income, Net + References No definition available. + Details
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