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Fair Value Measurements (Reconciliation of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs) (Detail) - Fair Value, Measurements, Recurring - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Transfers in and/or out of Level 3 (net), asset | ¥ 0 | ¥ 0 |  |  | ¥ 0 |
Level 3 | Loans Held-for-Sale |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 173,281 |  |  | ¥ 173,849 |  |
Gains or losses (realized/ unrealized), included in earnings, asset | 168 |  |  | 339 |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 4,064 |  |  | 18,249 |  |
Gains or losses (realized/ unrealized), asset, total | 4,232 |  |  | 18,588 |  |
Purchases, asset | 1,235 |  |  | 3,132 |  |
Sales, asset | (50,752) |  |  | (58,350) |  |
Settlements, asset | (607) |  |  | (9,830) |  |
Transfers in and/or out of Level 3 (net), asset | 0 |  |  | 0 |  |
Ending Balance, asset | 127,389 |  |  | 127,389 |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 162 |  |  | 140 |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 4,064 |  |  | 18,249 |  |
Level 3 | Available-for-sale debt securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 268,397 | 176,919 |  | 243,602 | 141,060 |
Gains or losses (realized/ unrealized), included in earnings, asset | 4,166 | 4,393 |  | 12,527 | 10,011 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 5,869 | 2,401 |  | 13,684 | 5,711 | [2]
Gains or losses (realized/ unrealized), asset, total | 10,035 | 6,794 |  | 26,211 | 15,722 |
Purchases, asset | 12,830 | 13,190 |  | 21,976 | 47,361 | [3]
Sales, asset | (2,900) | 0 |  | (3,651) | (5,678) |
Settlements, asset | (6,207) | (1,898) |  | (7,256) | (3,460) | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 1,273 | 0 |
Ending Balance, asset | 282,155 | 195,005 |  | 282,155 | 195,005 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 3,694 | 4,391 |  | 11,956 | 9,995 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 5,894 | 2,558 |  | 14,095 | 6,090 | [2]
Level 3 | Available-for-sale debt securities | Japanese prefectural and foreign municipal bond securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 4,871 | 3,409 |  | 3,331 | 3,053 |
Gains or losses (realized/ unrealized), included in earnings, asset | 0 | 0 |  | (80) | 0 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 154 | 203 |  | 501 | 559 | [2]
Gains or losses (realized/ unrealized), asset, total | 154 | 203 |  | 421 | 559 |
Purchases, asset | 0 | 0 |  | 0 | 0 | [3]
Sales, asset | 0 | 0 |  | 0 | 0 |
Settlements, asset | 0 | 0 |  | 0 | 0 | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 1,273 | 0 |
Ending Balance, asset | 5,025 | 3,612 |  | 5,025 | 3,612 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 0 | 0 |  | (80) | 0 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 125 | 203 |  | 472 | 559 | [2]
Level 3 | Available-for-sale debt securities | Corporate debt securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 5,152 | 625 |  | 4,737 | 697 |
Gains or losses (realized/ unrealized), included in earnings, asset | 249 | 0 |  | 719 | 0 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 0 | 0 |  | 0 | (1) | [2]
Gains or losses (realized/ unrealized), asset, total | 249 | 0 |  | 719 | (1) |
Purchases, asset | 0 | 0 |  | 14 | 0 | [3]
Sales, asset | 0 | 0 |  | 0 | 0 |
Settlements, asset | (1) | (275) |  | (70) | (346) | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | 5,400 | 350 |  | 5,400 | 350 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 156 | 0 |  | 539 | 0 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 0 | 0 |  | 0 | 0 | [2]
Level 3 | Available-for-sale debt securities | CMBS and RMBS in the Americas |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 0 |  |  | 0 |  |
Gains or losses (realized/ unrealized), included in earnings, asset | 0 |  |  | 0 |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 196 |  |  | 196 |  |
Gains or losses (realized/ unrealized), asset, total | 196 |  |  | 196 |  |
Purchases, asset | 6,879 |  |  | 6,879 |  |
Sales, asset | 0 |  |  | 0 |  |
Settlements, asset | 0 |  |  | 0 |  |
Transfers in and/or out of Level 3 (net), asset | 0 |  |  | 0 |  |
Ending Balance, asset | 7,075 |  |  | 7,075 |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 0 |  |  | 0 |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 0 |  |  | 0 |  |
Level 3 | Available-for-sale debt securities | Other asset-backed securities and debt securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 258,374 | 172,885 |  | 235,534 | 137,310 |
Gains or losses (realized/ unrealized), included in earnings, asset | 3,917 | 4,393 |  | 11,888 | 10,011 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 5,519 | 2,198 |  | 12,987 | 5,153 | [2]
Gains or losses (realized/ unrealized), asset, total | 9,436 | 6,591 |  | 24,875 | 15,164 |
Purchases, asset | 5,951 | 13,190 |  | 15,083 | 47,361 | [3]
Sales, asset | (2,900) | 0 |  | (3,651) | (5,678) |
Settlements, asset | (6,206) | (1,623) |  | (7,186) | (3,114) | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | 264,655 | 191,043 |  | 264,655 | 191,043 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 3,538 | 4,391 |  | 11,497 | 9,995 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 5,769 | 2,355 |  | 13,623 | 5,531 | [2]
Level 3 | Equity securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 154,246 | 124,735 |  | 140,563 | 112,972 |
Gains or losses (realized/ unrealized), included in earnings, asset | 868 | 2,539 |  | 2,383 | 3,874 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 4,956 | 6,881 |  | 17,036 | 19,692 | [2]
Gains or losses (realized/ unrealized), asset, total | 5,824 | 9,420 |  | 19,419 | 23,566 |
Purchases, asset | 823 | 621 |  | 1,060 | 2,500 | [3]
Sales, asset | (401) | (4,040) |  | (401) | (7,144) |
Settlements, asset | (361) | (364) |  | (510) | (1,522) | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | 160,131 | 130,372 |  | 160,131 | 130,372 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 874 | 2,336 |  | 2,175 | 3,155 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 4,936 | 6,880 |  | 17,037 | 19,688 | [2]
Level 3 | Equity securities | Investment funds, and others |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 154,246 | 124,735 |  | 140,563 | 112,972 |
Gains or losses (realized/ unrealized), included in earnings, asset | 868 | 2,539 |  | 2,383 | 3,874 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 4,956 | 6,881 |  | 17,036 | 19,692 | [2]
Gains or losses (realized/ unrealized), asset, total | 5,824 | 9,420 |  | 19,419 | 23,566 |
Purchases, asset | 823 | 621 |  | 1,060 | 2,500 | [3]
Sales, asset | (401) | (4,040) |  | (401) | (7,144) |
Settlements, asset | (361) | (364) |  | (510) | (1,522) | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | 160,131 | 130,372 |  | 160,131 | 130,372 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 874 | 2,336 |  | 2,175 | 3,155 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 4,936 | 6,880 |  | 17,037 | 19,688 | [2]
Level 3 | Certain investment in affiliates |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 2,727 |  |  | 2,511 |  |
Gains or losses (realized/ unrealized), included in earnings, asset | 0 |  |  | 0 |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 147 |  |  | 363 |  |
Gains or losses (realized/ unrealized), asset, total | 147 |  |  | 363 |  |
Purchases, asset | 2,282 |  |  | 2,282 |  |
Sales, asset | 0 |  |  | 0 |  |
Settlements, asset | (153) |  |  | (153) |  |
Transfers in and/or out of Level 3 (net), asset | 0 |  |  | 0 |  |
Ending Balance, asset | 5,003 |  |  | 5,003 |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 0 |  |  | 0 |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 147 |  |  | 363 |  |
Level 3 | Derivative assets and liabilities (net) |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | (4,716) | (17,781) |  | (7,824) | (3,772) |
Gains or losses (realized/ unrealized), included in earnings, asset | 632 | (5,681) |  | 4,229 | (18,486) | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | (130) | (1,377) |  | (619) | (2,581) | [2]
Gains or losses (realized/ unrealized), asset, total | 502 | (7,058) |  | 3,610 | (21,067) |
Purchases, asset | 0 | 0 |  | 0 | 0 | [3]
Sales, asset | 0 | 0 |  | 0 | 0 |
Settlements, asset | 0 | 0 |  | 0 | 0 | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | (4,214) | (24,839) |  | (4,214) | (24,839) |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 632 | (5,681) |  | 4,229 | (18,486) | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | (130) | (1,377) |  | (619) | (2,581) | [2]
Level 3 | Derivative assets and liabilities (net) | Options held/written and other |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | (4,716) | (17,781) |  | (7,824) | (3,772) |
Gains or losses (realized/ unrealized), included in earnings, asset | 632 | (5,681) |  | 4,229 | (18,486) | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | (130) | (1,377) |  | (619) | (2,581) | [2]
Gains or losses (realized/ unrealized), asset, total | 502 | (7,058) |  | 3,610 | (21,067) |
Purchases, asset | 0 | 0 |  | 0 | 0 | [3]
Sales, asset | 0 | 0 |  | 0 | 0 |
Settlements, asset | 0 | 0 |  | 0 | 0 | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | (4,214) | (24,839) |  | (4,214) | (24,839) |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 632 | (5,681) |  | 4,229 | (18,486) | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | (130) | (1,377) |  | (619) | (2,581) | [2]
Level 3 | Other assets |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 3,876 | 5,732 |  | 4,676 | 5,214 |
Gains or losses (realized/ unrealized), included in earnings, asset | (410) | (216) |  | (1,409) | 121 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 0 | 0 |  | 0 | 0 | [2]
Gains or losses (realized/ unrealized), asset, total | (410) | (216) |  | (1,409) | 121 |
Purchases, asset | 250 | 321 |  | 500 | 632 | [3]
Sales, asset | 0 | 0 |  | 0 | 0 |
Settlements, asset | (46) | (135) |  | (97) | (265) | [4]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 |
Ending Balance, asset | 3,670 | 5,702 |  | 3,670 | 5,702 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | (410) | (216) |  | (1,409) | 121 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 0 | 0 |  | 0 | 0 | [2]
Level 3 | Other assets | Reinsurance recoverables |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, asset | 3,876 | 5,732 |  | 4,676 | 5,214 | [5]
Gains or losses (realized/ unrealized), included in earnings, asset | (410) | (216) |  | (1,409) | 121 | [1],[5]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | 0 | 0 |  | 0 | 0 | [2],[5]
Gains or losses (realized/ unrealized), asset, total | (410) | (216) |  | (1,409) | 121 | [5]
Purchases, asset | 250 | 321 |  | 500 | 632 | [3],[5]
Sales, asset | 0 | 0 |  | 0 | 0 |
Settlements, asset | (46) | (135) |  | (97) | (265) | [4],[5]
Transfers in and/or out of Level 3 (net), asset | 0 | 0 |  | 0 | 0 | [5]
Ending Balance, asset | 3,670 | 5,702 | [5] | 3,670 | 5,702 | [5]
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | (410) | (216) |  | (1,409) | 121 | [1],[5]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | 0 | 0 |  | 0 | 0 | [2],[5]
Level 3 | Policy liabilities and policy account balances |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, liability | 170,568 | 180,791 |  | 163,734 | 198,905 |
Gains or losses (realized/ unrealized), included in earnings, liability | 3,028 | 2,204 |  | (10,121) | 11,679 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | (110) | 106 |  | (170) | 83 | [2]
Gains or losses (realized/ unrealized), liability, total | 2,918 | 2,310 |  | (10,291) | 11,762 |
Purchases, liability | 0 | 0 |  | 0 | 0 | [3]
Sales, liability | 0 | 0 |  | 0 | 0 |
Settlements, liability | (7,473) | (8,304) |  | (13,848) | (16,966) | [4]
Transfers in and/or out of Level 3 (net), liability | 0 | 0 |  | 0 | 0 |
Ending Balance, liability | 160,177 | 170,177 |  | 160,177 | 170,177 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 3,028 | 2,204 |  | (10,121) | 11,679 | [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | (110) | 106 |  | (170) | 83 | [2]
Level 3 | Policy liabilities and policy account balances | Variable annuity and variable life insurance contracts |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance, liability | 170,568 | 180,791 |  | 163,734 | 198,905 | [6]
Gains or losses (realized/ unrealized), included in earnings, liability | 3,028 | 2,204 |  | (10,121) | 11,679 | [1],[6]
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | (110) | 106 |  | (170) | 83 | [2],[6]
Gains or losses (realized/ unrealized), liability, total | 2,918 | 2,310 |  | (10,291) | 11,762 | [6]
Purchases, liability | 0 | 0 |  | 0 | 0 | [3],[6]
Sales, liability | 0 | 0 |  | 0 | 0 |
Settlements, liability | (7,473) | (8,304) |  | (13,848) | (16,966) | [4],[6]
Transfers in and/or out of Level 3 (net), liability | 0 | 0 |  | 0 | 0 | [6]
Ending Balance, liability | 160,177 | 170,177 | [6] | 160,177 | 170,177 | [6]
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 3,028 | 2,204 |  | (10,121) | 11,679 | [1],[6]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | ¥ (110) | ¥ 106 |  | ¥ (170) | ¥ 83 | [2],[6]
[1] | Principally, gains and losses from loans held for sale are included in “Revenues from interest on loans”, available-for-sale debt securities are included in “Gains on investment securities and dividends”, “Write-downs of securities” or “Life insurance premiums and related investment income”; equity securities are included in “Gains on investment securities and dividends” and “Life insurance premiums and related investment income” and derivative assets and liabilities (net) are included in “Other (income) and expense” respectively. Additionally, for available-for-sale debt securities, amortization of interest recognized in finance revenues is included in these columns.
[2] | Unrealized gains and losses from loans held for sale are included in “Net change of foreign currency translation adjustments”, unrealized gains and losses from available-for-sale debt securities are included in “Net change of unrealized gains (losses) on investment in securities” and “Net change of foreign currency translation adjustments”, unrealized gains and losses from equity securities, certain investment in affiliates, and derivative assets and liabilities (net) are included mainly in “Net change of foreign currency translation adjustments”, unrealized gains and losses from policy liabilities and policy account balances are included in “Net change of debt valuation adjustments.”
[3] | Increases resulting from an acquisition of a subsidiary and insurance contracts ceded to reinsurance companies are included.
[4] | Decreases resulting from the receipts of reimbursements for benefits, and decreases resulting from insurance payouts to variable annuity and variable life policyholders due to death, surrender and maturity of the investment period are included.
[5] | “Included in earnings” in the above table includes changes in the fair value of reinsurance contracts recorded in “Life insurance costs” and reinsurance premiums, net of reinsurance benefits received, recorded in “Life insurance premiums and related investment income.”
[6] | “Included in earnings” in the above table is recorded in “Life insurance costs” and includes changes in the fair value of policy liabilities and policy account balances resulting from gains or losses on the underlying investment assets managed on behalf of variable annuity and variable life policyholders, and the changes in the minimum guarantee risks relating to variable annuity and variable life insurance contracts as well as insurance costs recognized for insurance and annuity payouts as a result of insured events.

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities, Change in Unrealized Gains and (Losses) Related to Instruments Held + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gains Losses Realized Unrealized Asset. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liability gains losses realized unrealized liability. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis other comprehensive income for assets and liabilities change in unrealized gains and losses related to instruments held. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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