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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 - Level 3 - JPY (¥)
¥ in Millions
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Loans Held-for-Sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset ¥ 67,794 ¥ 96,566
Gains or losses (realized/ unrealized), included in earnings, asset [1] (682) (222)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (561) (4,910)
Gains or losses (realized/ unrealized), asset, total (1,243) (5,132)
Purchases, asset [3] 63 453
Sales, asset 0 0
Settlements, asset [4] (14,018) (8,837)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 52,596 83,050
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (147) 56
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (561) (4,910)
Available-for-sale debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset 217,654 319,297
Gains or losses (realized/ unrealized), included in earnings, asset [1] 3,852 (3,251)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 2,802 (6,019)
Gains or losses (realized/ unrealized), asset, total 6,654 (9,270)
Purchases, asset [3] 117,856 65,240
Sales, asset (560) (50,630)
Settlements, asset [4] (48,834) (88,336)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 292,770 236,301
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 4,537 (3,649)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 303 25,351
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 10,878 10,922
Gains or losses (realized/ unrealized), included in earnings, asset [1] (177) (61)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (97) (476)
Gains or losses (realized/ unrealized), asset, total (274) (537)
Purchases, asset [3] 0 0
Sales, asset 0 0
Settlements, asset [4] (187) (9)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 10,417 10,376
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (177) (61)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (97) (476)
Available-for-sale debt securities | Corporate debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset 4,252 5,586
Gains or losses (realized/ unrealized), included in earnings, asset [1] 4,792 (124)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 4,016 (15)
Gains or losses (realized/ unrealized), asset, total 8,808 (139)
Purchases, asset [3] 107,208 0
Sales, asset 0 0
Settlements, asset [4] 0 (70)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 120,268 5,377
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 4,792 (325)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (2) (15)
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 7,082 7,165
Gains or losses (realized/ unrealized), included in earnings, asset [1] 0 0
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (44) (403)
Gains or losses (realized/ unrealized), asset, total (44) (403)
Purchases, asset [3] 0 0
Sales, asset 0 0
Settlements, asset [4] 0 0
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 7,038 6,762
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] (45) (403)
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 195,442 295,624
Gains or losses (realized/ unrealized), included in earnings, asset [1] (763) (3,066)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (1,073) (5,125)
Gains or losses (realized/ unrealized), asset, total (1,836) (8,191)
Purchases, asset [3] 10,648 65,240
Sales, asset (560) (50,630)
Settlements, asset [4] (48,647) (88,257)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 155,047 213,786
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (78) (3,263)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 447 26,245
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset 162,210 162,857
Gains or losses (realized/ unrealized), included in earnings, asset [1] 5,797 (4,902)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (387) (9,831)
Gains or losses (realized/ unrealized), asset, total 5,410 (14,733)
Purchases, asset [3] 17,453 19,451
Sales, asset 0 0
Settlements, asset [4] (2,036) (1,923)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 183,037 165,652
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 5,815 (4,956)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (384) (9,834)
Equity securities | Investment funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset 162,210 162,857
Gains or losses (realized/ unrealized), included in earnings, asset [1] 5,797 (4,902)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (387) (9,831)
Gains or losses (realized/ unrealized), asset, total 5,410 (14,733)
Purchases, asset [3] 17,453 19,451
Sales, asset 0 0
Settlements, asset [4] (2,036) (1,923)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 183,037 165,652
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 5,815 (4,956)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (384) (9,834)
Derivative assets and liabilities (net)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset 8,165 2,284
Gains or losses (realized/ unrealized), included in earnings, asset [1] 150 6,921
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (251) (538)
Gains or losses (realized/ unrealized), asset, total (101) 6,383
Purchases, asset [3] 0 0
Sales, asset 0 0
Settlements, asset [4] 0 0
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 8,064 8,667
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 150 6,921
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (251) (538)
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 8,165 2,284
Gains or losses (realized/ unrealized), included in earnings, asset [1] 150 6,921
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (251) (538)
Gains or losses (realized/ unrealized), asset, total (101) 6,383
Purchases, asset [3] 0 0
Sales, asset 0 0
Settlements, asset [4] 0 0
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 8,064 8,667
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 150 6,921
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (251) (538)
Other assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset 2,586 2,786
Gains or losses (realized/ unrealized), included in earnings, asset [1] (1,421) (365)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 0 0
Gains or losses (realized/ unrealized), asset, total (1,421) (365)
Purchases, asset [3] 412 476
Sales, asset 0 0
Settlements, asset [4] (62) (38)
Transfers in and/or out of Level 3 (net), asset 0 0
Ending Balance, asset 1,515 2,859
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (1,421) (365)
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
Other assets | Reinsurance recoverables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, asset [5] 2,586 2,786
Gains or losses (realized/ unrealized), included in earnings, asset [1],[5] (1,421) (365)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2],[5] 0 0
Gains or losses (realized/ unrealized), asset, total [5] (1,421) (365)
Purchases, asset [3],[5] 412 476
Sales, asset [5] 0 0
Settlements, asset [4],[5] (62) (38)
Transfers in and/or out of Level 3 (net), asset [5] 0 0
Ending Balance, asset [5] 1,515 2,859
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1],[5] (1,421) (365)
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
Policy liabilities and policy account balances    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, liability 136,257 167,207
Gains or losses (realized/ unrealized), included in earnings, liability [1] (17,278) 4,141
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2] 264 (104)
Gains or losses (realized/ unrealized), liability, total (17,014) 4,037
Purchases, liability [3] 0 0
Sales, liability 0 0
Settlements, liability [4] (10,571) (11,839)
Transfers in and/or out of Level 3 (net), liability 0 0
Ending Balance, liability 142,700 151,331
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (17,278) 4,141
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 264 (104)
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] 136,257 167,207
Gains or losses (realized/ unrealized), included in earnings, liability [1],[6] (17,278) 4,141
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2],[6] 264 (104)
Gains or losses (realized/ unrealized), liability, total [6] (17,014) 4,037
Purchases, liability [3],[6] 0 0
Sales, liability [6] 0 0
Settlements, liability [4],[6] (10,571) (11,839)
Transfers in and/or out of Level 3 (net), liability [6] 0 0
Ending Balance, liability [6] 142,700 151,331
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1],[6] (17,278) 4,141
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2],[6] 264 (104)
Accounts Payable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, liability 15,259 14,136
Gains or losses (realized/ unrealized), included in earnings, liability [1] (244) (382)
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2] (1,190) 344
Gains or losses (realized/ unrealized), liability, total (1,434) (38)
Purchases, liability [3] 1,475 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 18,168 14,174
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (244) (382)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (1,190) 344
Accounts Payable | Contingent Consideration    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance, liability 15,259 14,136
Gains or losses (realized/ unrealized), included in earnings, liability [1] (244) (382)
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2] (1,190) 344
Gains or losses (realized/ unrealized), liability, total (1,434) (38)
Purchases, liability [3] 1,475 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 18,168 14,174
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (244) (382)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] ¥ (1,190) ¥ 344
[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 a reconciliation of the total amount of policy account balances and the balances of market risk benefits related to variable annuity and variable life insurance contracts during year ended March 31, 2025 and for the six months ended September 30, 2025, see Note 18 “Long-Durations Insurance Contracts Relating to Life Insurance Operations.”