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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
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
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 |  | ¥ 96,566 | ¥ 173,849 | ¥ 0 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (1,778) | 566 | 18 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (543) | 18,937 | 1,095 |
Gains or losses (realized/ unrealized), asset, total |  | (2,321) | 19,503 | 1,113 |
Purchases, asset | [3] | 633 | 4,467 | 2,457 |
Sales, asset |  | 0 | (66,078) | (5,776) |
Settlements, asset | [4] | (27,084) | (35,175) | 0 |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 176,055 |
Ending Balance, asset |  | 67,794 | 96,566 | 173,849 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (708) | 0 | 18 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (543) | 18,937 | 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 |  | 319,297 | 243,602 | 141,060 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 1,336 | 13,906 | 3,788 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (1,437) | 17,117 | 1,238 |
Gains or losses (realized/ unrealized), asset, total |  | (101) | 31,023 | 5,026 |
Purchases, asset | [3] | 99,785 | 68,295 | 116,175 |
Sales, asset |  | (56,749) | (15,041) | (9,100) |
Settlements, asset | [4] | (144,578) | (15,400) | (9,559) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 6,818 | 0 |
Ending Balance, asset |  | 217,654 | 319,297 | 243,602 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 370 | 12,918 | 3,458 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (463) | 18,018 | 1,713 |
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 |  | 10,922 | 3,331 | 3,053 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (107) | (75) | 0 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 82 | 866 | 278 |
Gains or losses (realized/ unrealized), asset, total |  | (25) | 791 | 278 |
Purchases, asset | [3] | 0 | 0 | 0 |
Sales, asset |  | 0 | 0 | 0 |
Settlements, asset | [4] | (19) | (18) | 0 |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 6,818 | 0 |
Ending Balance, asset |  | 10,878 | 10,922 | 3,331 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (107) | (75) | 0 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 82 | 809 | 278 |
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 |  | 5,586 | 4,737 | 697 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 235 | 974 | 89 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (17) | 1 | (1) |
Gains or losses (realized/ unrealized), asset, total |  | 218 | 975 | 88 |
Purchases, asset | [3] | 300 | 14 | 5,922 |
Sales, asset |  | (1,712) | 0 | (1,554) |
Settlements, asset | [4] | (140) | (140) | (416) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0 |
Ending Balance, asset |  | 4,252 | 5,586 | 4,737 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (73) | 608 | (16) |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (17) | 1 | 0 |
Fair Value, Measurements, Recurring | 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 |  | 7,165 | 0 |  |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 0 | 0 |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (83) | 286 |  |
Gains or losses (realized/ unrealized), asset, total |  | (83) | 286 |  |
Purchases, asset | [3] | 0 | 6,879 |  |
Sales, asset |  | 0 | 0 |  |
Settlements, asset | [4] | 0 | 0 |  |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 |  |
Ending Balance, asset |  | 7,082 | 7,165 | 0 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 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] | (83) | 282 |  |
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 |  | 295,624 | 235,534 | 137,310 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 1,208 | 13,007 | 3,699 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (1,419) | 15,964 | 961 |
Gains or losses (realized/ unrealized), asset, total |  | (211) | 28,971 | 4,660 |
Purchases, asset | [3] | 99,485 | 61,402 | 110,253 |
Sales, asset |  | (55,037) | (15,041) | (7,546) |
Settlements, asset | [4] | (144,419) | (15,242) | (9,143) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0 |
Ending Balance, asset |  | 195,442 | 295,624 | 235,534 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 550 | 12,385 | 3,474 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (445) | 16,926 | 1,435 |
Fair Value, Measurements, Recurring | Level 3 | Equity securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning Balance, asset |  | 162,857 | 143,074 | 112,972 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (8,129) | (841) | 22,823 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (2,089) | 18,617 | 9,647 |
Gains or losses (realized/ unrealized), asset, total |  | (10,218) | 17,776 | 32,470 |
Purchases, asset | [3] | 20,113 | 4,675 | 7,191 |
Sales, asset |  | (656) | (495) | (7,223) |
Settlements, asset | [4] | (9,886) | (2,173) | (2,336) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0 |
Ending Balance, asset |  | 162,210 | 162,857 | 143,074 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (8,163) | (1,097) | 22,113 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (2,099) | 18,617 | 9,514 |
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 |  | 162,857 | 143,074 | 112,972 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (8,129) | (841) | 22,823 |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | (2,089) | 18,617 | 9,647 |
Gains or losses (realized/ unrealized), asset, total |  | (10,218) | 17,776 | 32,470 |
Purchases, asset | [3] | 20,113 | 4,675 | 7,191 |
Sales, asset |  | (656) | (495) | (7,223) |
Settlements, asset | [4] | (9,886) | (2,173) | (2,336) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0 |
Ending Balance, asset |  | 162,210 | 162,857 | 143,074 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (8,163) | (1,097) | 22,113 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (2,099) | 18,617 | 9,514 |
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 |  | 2,284 | (7,824) | (3,772) |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 5,480 | 10,595 | (2,845) |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 401 | (487) | (1,207) |
Gains or losses (realized/ unrealized), asset, total |  | 5,881 | 10,108 | (4,052) |
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 |  | 8,165 | 2,284 | (7,824) |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 5,480 | 10,595 | (2,845) |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 401 | (487) | (1,207) |
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 |  | 2,284 | (7,824) | (3,772) |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | 5,480 | 10,595 | (2,845) |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 401 | (487) | (1,207) |
Gains or losses (realized/ unrealized), asset, total |  | 5,881 | 10,108 | (4,052) |
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 |  | 8,165 | 2,284 | (7,824) |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 5,480 | 10,595 | (2,845) |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 401 | (487) | (1,207) |
Fair Value, Measurements, Recurring | Level 3 | Other assets |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning Balance, asset |  | 2,786 | 4,676 | 5,214 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1] | (1,027) | (2,711) | (1,286) |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2] | 0 | 0 | 0 |
Gains or losses (realized/ unrealized), asset, total |  | (1,027) | (2,711) | (1,286) |
Purchases, asset | [3] | 916 | 971 | 1,153 |
Sales, asset |  | 0 | 0 | 0 |
Settlements, asset | [4] | (89) | (150) | (405) |
Transfers in and/or out of Level 3 (net), asset |  | 0 | 0 | 0 |
Ending Balance, asset |  | 2,586 | 2,786 | 4,676 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (1,027) | (2,711) | (1,286) |
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] | 2,786 | 4,676 | 5,214 |
Gains or losses (realized/ unrealized), included in earnings, asset | [1],[5] | (1,027) | (2,711) | (1,286) |
Gains or losses (realized/ unrealized), included in other comprehensive income, asset | [2],[5] | 0 | 0 | 0 |
Gains or losses (realized/ unrealized), asset, total | [5] | (1,027) | (2,711) | (1,286) |
Purchases, asset | [3],[5] | 916 | 971 | 1,153 |
Sales, asset | [5] | 0 | 0 | 0 |
Settlements, asset | [4],[5] | (89) | (150) | (405) |
Transfers in and/or out of Level 3 (net), asset | [5] | 0 | 0 | 0 |
Ending Balance, asset | [5] | 2,586 | 2,786 | 4,676 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1],[5] | (1,027) | (2,711) | (1,286) |
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 |  | 167,207 | 163,734 | 198,905 |
Gains or losses (realized/ unrealized), included in earnings, liability | [1] | 7,292 | (30,205) | 6,343 |
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | [2] | (48) | (265) | 74 |
Gains or losses (realized/ unrealized), liability, total |  | 7,244 | (30,470) | 6,417 |
Purchases, liability | [3] | 0 | 0 | 0 |
Sales, liability |  | 0 | 0 | 0 |
Settlements, liability | [4] | (23,706) | (26,997) | (28,754) | [6]
Transfers in and/or out of Level 3 (net), liability |  | 0 | 0 | 0 |
Ending Balance, liability |  | 136,257 | 167,207 | 163,734 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | 7,292 | (30,205) | 6,343 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | (48) | (265) | 74 |
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] | 167,207 | 163,734 | 198,905 |
Gains or losses (realized/ unrealized), included in earnings, liability | [1],[6] | 7,292 | (30,205) | 6,343 |
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | [2],[6] | (48) | (265) | 74 |
Gains or losses (realized/ unrealized), liability, total | [6] | 7,244 | (30,470) | 6,417 |
Purchases, liability | [3],[6] | 0 | 0 | 0 |
Sales, liability | [6] | 0 | 0 | 0 |
Settlements, liability | [4],[6] | (23,706) | (26,997) | (28,754) |
Transfers in and/or out of Level 3 (net), liability | [6] | 0 | 0 | 0 |
Ending Balance, liability | [6] | 136,257 | 167,207 | 163,734 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1],[6] | 7,292 | (30,205) | 6,343 |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2],[6] | (48) | (265) | 74 |
Fair Value, Measurements, Recurring | Level 3 | Accounts Payable |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning Balance, liability |  | 14,136 | 12,576 |  |
Gains or losses (realized/ unrealized), included in earnings, liability | [1] | (1,235) | (47) |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | [2] | 112 | (1,513) |  |
Gains or losses (realized/ unrealized), liability, total |  | (1,123) | (1,560) |  |
Purchases, liability | [3] | 0 | 0 |  |
Sales, liability |  | 0 | 0 |  |
Settlements, liability | [4] | 0 | 0 |  |
Transfers in and/or out of Level 3 (net), liability |  | 0 | 0 |  |
Ending Balance, liability |  | 15,259 | 14,136 | 12,576 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (1,235) | (47) |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | 112 | (1,513) |  |
Fair Value, Measurements, Recurring | Level 3 | Accounts Payable | Contingent Consideration |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning Balance, liability |  | 14,136 | 12,576 |  |
Gains or losses (realized/ unrealized), included in earnings, liability | [1] | (1,235) | (47) |  |
Gains or losses (realized/ unrealized), included in other comprehensive income, liability | [2] | 112 | (1,513) |  |
Gains or losses (realized/ unrealized), liability, total |  | (1,123) | (1,560) |  |
Purchases, liability | [3] | 0 | 0 |  |
Sales, liability |  | 0 | 0 |  |
Settlements, liability | [4] | 0 | 0 |  |
Transfers in and/or out of Level 3 (net), liability |  | 0 | 0 |  |
Ending Balance, liability |  | 15,259 | 14,136 | ¥ 12,576 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | [1] | (1,235) | (47) |  |
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period | [2] | ¥ 112 | ¥ (1,513) |  |
[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 loans held for sale, derivative assets and liabilities (net), and accounts payable 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 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.”, unrealized gains and losses from accounts payable are included in “Net change of foreign currency translation 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. For the information about policy account balances for variable annuity and variable life insurance contracts and market risk benefits as of and for the fiscal year ended March 31, 2024 and 2025, see Note 24 “Long-Duration Insurance Contracts Relating to Life Insurance Operations.”

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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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