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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Derivatives not designated as hedging instruments) (Detail) - Nondesignated - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Interest rate swap agreements | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | ¥ 0 | [1] | ¥ 0 | [2] | ¥ 0 | [3]
Interest rate swap agreements | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative | [4] | 0 |  | 4 |  | 5 |
Interest rate swap agreements | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 39 |  | 92 |  | (222) |
Futures | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | (262) | [1] | (3,046) | [2] | (855) | [3]
Futures | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative | [4] | 0 |  | 0 |  | 0 |
Futures | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 300 |  | 1,073 |  | (1,300) |
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | (10,355) | [1] | 40,127 | [2] | 21,659 | [3]
Foreign exchange contracts | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative | [4] | (22,260) |  | 2,980 |  | 4,231 |
Foreign exchange contracts | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | (1,910) |  | 16,152 |  | 49,589 |
Credit derivatives held/written | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 0 | [1] | 0 | [2] | 0 | [3]
Credit derivatives held/written | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative | [4] | 0 |  | 0 |  | 0 |
Credit derivatives held/written | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 0 |  | (27) |  | 3 |
Options held/written and other | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 0 | [1] | 0 | [2] | 0 | [3]
Options held/written and other | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative | [4] | 0 |  | 0 |  | 0 |
Options held/written and other | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | ¥ (7,399) |  | ¥ 750 |  | ¥ 1,828 |
[1] | Futures and foreign exchange contracts in the above table include gains (losses) arising from futures and foreign exchange contracts held to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts for fiscal 2025 (see Note 23 “Income and Expenses Relating to Life Insurance Operations”).
[2] | Futures and foreign exchange contracts in the above table include gains (losses) arising from futures and foreign exchange contracts held to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts for fiscal 2024 (see Note 23 “Income and Expenses Relating to Life Insurance Operations”).
[3] | Futures and foreign exchange contracts in the above table include gains (losses) arising from futures and foreign exchange contracts held to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts for fiscal 2023 (see Note 23 “Income and Expenses Relating to Life Insurance Operations”).
[4] | The portion of gains (losses) recognized in income on derivative arising from foreign exchange contracts that represents interest rate adjustments is recognized as interest expense.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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