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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) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive Income (Loss), Net of Tax |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive Income (Loss), Net of Tax |  |
Fair Value, Measurements, Recurring | Level 3 | Loans Held-for-Sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | ¥ 0 |  |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 18 |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 1,095 |  |
Gains or losses (realized/ unrealized), asset, total |  | 1,113 |  |
Purchases, asset | [3] | 2,457 |  |
Sales, asset |  | (5,776) |  |
Settlements, asset | [4] | 0 |  |
Transfers in and/or out of Level 3 (net), asset |  | 176,055 |  |
Ending Balance, asset |  | 173,849 | ¥ 0 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 18 |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 1,095 |  |
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale debt securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | 141,060 | 133,457 | ¥ 88,353
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 3,788 | 7,041 | (1,065)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 1,238 | 6,941 | 14,870
Gains or losses (realized/ unrealized), asset, total |  | 5,026 | 13,982 | 13,805
Purchases, asset | [3] | 116,175 | 51,644 | 51,270
Sales, asset |  | (9,100) | (9,465) | (12,890)
Settlements, asset | [4] | (9,559) | (48,558) | (5,187)
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | (1,894)
Ending Balance, asset |  | 243,602 | 141,060 | 133,457
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 3,458 | 2,445 | (1,228)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 1,713 | 7,116 | 14,729
Fair Value, Measurements, Recurring | 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 |  | 3,053 | 2,761 | 2,832
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 0 | 0 | (115)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 278 | 292 | 44
Gains or losses (realized/ unrealized), asset, total |  | 278 | 292 | (71)
Purchases, asset | [3] | 0 | 0 | 0
Sales, asset |  | 0 | 0 | 0
Settlements, asset | [4] | 0 | 0 | 0
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0
Ending Balance, asset |  | 3,331 | 3,053 | 2,761
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 0 | 0 | (115)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 278 | 291 | 44
Fair Value, Measurements, Recurring | 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 |  | 697 | 1,021 | 3,994
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 89 | 0 | 0
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (1) | (1) | 1
Gains or losses (realized/ unrealized), asset, total |  | 88 | (1) | 1
Purchases, asset | [3] | 5,922 | 0 | 0
Sales, asset |  | (1,554) | 0 | 0
Settlements, asset | [4] | (416) | (323) | (974)
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | (2,000)
Ending Balance, asset |  | 4,737 | 697 | 1,021
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (16) | 0 | 0
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 0 | (1) | 1
Fair Value, Measurements, Recurring | 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 |  | 137,310 | 129,675 | 81,527
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 3,699 | 7,041 | (950)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 961 | 6,650 | 14,825
Gains or losses (realized/ unrealized), asset, total |  | 4,660 | 13,691 | 13,875
Purchases, asset | [3] | 110,253 | 51,644 | 51,270
Sales, asset |  | (7,546) | (9,465) | (12,890)
Settlements, asset | [4] | (9,143) | (48,235) | (4,213)
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 106
Ending Balance, asset |  | 235,534 | 137,310 | 129,675
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 3,474 | 2,445 | (1,113)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 1,435 | 6,826 | 14,684
Fair Value, Measurements, Recurring | Level 3 | Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | 112,972 | 91,410 | 83,901
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 22,823 | 16,350 | 14,304
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 9,642 | 8,779 | 1,765
Gains or losses (realized/ unrealized), asset, total |  | 32,465 | 25,129 | 16,069
Purchases, asset | [3] | 4,685 | 24,606 | 2,001
Sales, asset |  | (7,223) | (26,795) | (4,718)
Settlements, asset | [4] | (2,336) | (768) | (5,518)
Transfers in and/or out of Level 3 (net), asset |  | 0 | (610) | (325)
Ending Balance, asset |  | 140,563 | 112,972 | 91,410
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 22,113 | 4,555 | 14,042
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 9,509 | 8,743 | 1,769
Fair Value, Measurements, Recurring | Level 3 | Equity securities | Investment funds, and others |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | 112,972 | 91,410 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 22,823 | 16,350 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 9,642 | 8,779 |
Gains or losses (realized/ unrealized), asset, total |  | 32,465 | 25,129 |
Purchases, asset | [3] | 4,685 | 24,606 |
Sales, asset |  | (7,223) | (26,795) |
Settlements, asset | [4] | (2,336) | (768) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | (610) |
Ending Balance, asset |  | 140,563 | 112,972 | 91,410
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 22,113 | 4,555 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 9,509 | 8,743 |
Fair Value, Measurements, Recurring | Level 3 | Equity securities | Investment funds |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  |  | 91,410 | 83,901
Gains or losses (realized/ unrealized), included in earnings, asset | [1] |  |  | 14,304
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] |  |  | 1,765
Gains or losses (realized/ unrealized), asset, total |  |  |  | 16,069
Purchases, asset | [3] |  |  | 2,001
Sales, asset |  |  |  | (4,718)
Settlements, asset | [4] |  |  | (5,518)
Transfers in and/or out of Level 3 (net), asset |  |  |  | (325)
Ending Balance, asset |  |  |  | 91,410
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] |  |  | 14,042
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] |  |  | 1,769
Fair Value, Measurements, Recurring | Level 3 | Certain investment in affiliates |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | 0 |  |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 0 |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 5 |  |
Gains or losses (realized/ unrealized), asset, total |  | 5 |  |
Purchases, asset | [3] | 2,506 |  |
Sales, asset |  | 0 |  |
Settlements, asset | [4] | 0 |  |
Transfers in and/or out of Level 3 (net), asset |  | 0 |  |
Ending Balance, asset |  | 2,511 | 0 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 0 |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 5 |  |
Fair Value, Measurements, Recurring | Level 3 | Derivative assets and liabilities (net) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | (3,772) | 13,790 | 19,230
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (2,845) | (18,340) | (5,474)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (1,207) | 778 | 34
Gains or losses (realized/ unrealized), asset, total |  | (4,052) | (17,562) | (5,440)
Purchases, asset | [3] | 0 | 0 | 0
Sales, asset |  | 0 | 0 | 0
Settlements, asset | [4] | 0 | 0 | 0
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0
Ending Balance, asset |  | (7,824) | (3,772) | 13,790
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (2,845) | (18,340) | (5,474)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (1,207) | 778 | 34
Fair Value, Measurements, Recurring | 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 |  | (3,772) | 13,790 | 19,230
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (2,845) | (18,340) | (5,474)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (1,207) | 778 | 34
Gains or losses (realized/ unrealized), asset, total |  | (4,052) | (17,562) | (5,440)
Purchases, asset | [3] | 0 | 0 | 0
Sales, asset |  | 0 | 0 | 0
Settlements, asset | [4] | 0 | 0 | 0
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0
Ending Balance, asset |  | (7,824) | (3,772) | 13,790
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (2,845) | (18,340) | (5,474)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (1,207) | 778 | 34
Fair Value, Measurements, Recurring | Level 3 | Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset |  | 5,214 | 6,297 | 18,206
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (1,286) | (2,146) | (14,201)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 0 | 0 | 0
Gains or losses (realized/ unrealized), asset, total |  | (1,286) | (2,146) | (14,201)
Purchases, asset | [3] | 1,153 | 1,835 | 2,713
Sales, asset |  | 0 | 0 | 0
Settlements, asset | [4] | (405) | (772) | (421)
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0
Ending Balance, asset |  | 4,676 | 5,214 | 6,297
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (1,286) | (2,146) | (14,201)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Other assets | Reinsurance recoverables |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, asset | [5] | 5,214 | 6,297 | 18,206
Gains or losses (realized/ unrealized), included in earnings, asset | [1],[5] | (1,286) | (2,146) | (14,201)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2],[5] | 0 | 0 | 0
Gains or losses (realized/ unrealized), asset, total | [5] | (1,286) | (2,146) | (14,201)
Purchases, asset | [3],[5] | 1,153 | 1,835 | 2,713
Sales, asset | [5] | 0 | 0 | 0
Settlements, asset | [4],[5] | (405) | (772) | (421)
Transfers in and/or out of Level 3 (net), asset | [5] | 0 | 0 | 0
Ending Balance, asset | [5] | 4,676 | 5,214 | 6,297
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1],[5] | (1,286) | (2,146) | (14,201)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2],[5] | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Policy liabilities and policy account balances |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning Balance, liability |  | 198,905 | 266,422 | 300,739
Gains or losses (realized/ unrealized), included in earnings, liability | [1] | 6,343 | (1,743) | (42,066)
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | [2] | 74 | (467) | (1,248)
Gains or losses (realized/ unrealized), liability, total |  | 6,417 | (2,210) | (43,314)
Purchases, liability | [3] | 0 | 0 | 0
Sales, liability |  | 0 | 0 | 0
Settlements, liability | [4] | (28,754) | (69,727) | (77,631)
Transfers in and/or out of Level 3 (net), liability |  | 0 | 0 | 0
Ending Balance, liability |  | 163,734 | 198,905 | 266,422
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 6,343 | (1,743) | (42,066)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 74 | (467) | (1,248)
Fair Value, Measurements, Recurring | 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 | [6] | 198,905 | 266,422 | 300,739
Gains or losses (realized/ unrealized), included in earnings, liability | [1],[6] | 6,343 | (1,743) | (42,066)
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | [2],[6] | 74 | (467) | (1,248)
Gains or losses (realized/ unrealized), liability, total | [6] | 6,417 | (2,210) | (43,314)
Purchases, liability | [3],[6] | 0 | 0 | 0
Sales, liability | [6] | 0 | 0 | 0
Settlements, liability | [4],[6] | (28,754) | (69,727) | (77,631)
Transfers in and/or out of Level 3 (net), liability | [6] | 0 | 0 | 0
Ending Balance, liability | [6] | 163,734 | 198,905 | 266,422
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1],[6] | 6,343 | (1,743) | (42,066)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2],[6] | ¥ 74 | ¥ (467) | ¥ (1,248)
[1] | Principally, gains and losses from 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 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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of sale 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of settlement 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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