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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
--- | ---
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 |  | ¥ 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 |  | 5 |  | 6 |  | 7 |
Interest rate swap agreements | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | (222) |  | (22) |  | (13) |
Futures | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | (855) | [1] | (1,075) | [2] | (9,412) | [3]
Futures | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 0 |  | 0 |  | 0 |
Futures | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | (1,300) |  | 186 |  | 6,980 |
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 21,659 | [1] | 20,254 | [2] | (215) | [3]
Foreign exchange contracts | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 4,231 |  | 1,308 |  | 2,085 |
Foreign exchange contracts | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 49,589 |  | 38,330 |  | 12,814 |
Credit derivatives held | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  |  |  | 0 | [2] | 0 | [3]
Credit derivatives held | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  |  |  | 0 |  | 0 |
Credit derivatives held | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  |  |  | (1) |  | 1 |
Credit derivatives held/written | Life insurance premiums and related investment income |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative | [1] | 0 |  |  |  |  |
Credit derivatives held/written | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 0 |  |  |  |  |
Credit derivatives held/written | Other (income) and expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 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] | (598) | [3]
Options held/written and other | Interest expense |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gains (losses) recognized in income on derivative |  | 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 |  | ¥ 1,828 |  | ¥ (749) |  | ¥ (2,419) |
[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 2023 (see Note 23 “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 2022 (see Note 23 “Life Insurance Operations”).
[3] | Futures, foreign exchange contracts and options held/written and other in the above table include gains (losses) arising from futures, foreign exchange contracts and options held to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts for fiscal 2021 (see Note 23 “Life Insurance Operations”).

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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