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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, 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.”