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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, 2024
Mar. 31, 2023
Mar. 31, 2022
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 ¥ 173,849 ¥ 0  
Gains or losses (realized/ unrealized), included in earnings, asset [1] 566 18  
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 18,937 1,095  
Gains or losses (realized/ unrealized), asset, total 19,503 1,113  
Purchases, asset [3] 4,467 2,457  
Sales, asset (66,078) (5,776)  
Settlements, asset [4] (35,175) 0  
Transfers in and/or out of Level 3 (net), asset 0 176,055  
Ending Balance, asset 96,566 173,849 ¥ 0
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 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] 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 243,602 141,060 133,457
Gains or losses (realized/ unrealized), included in earnings, asset [1] 13,906 3,788 7,041
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 17,117 1,238 6,941
Gains or losses (realized/ unrealized), asset, total 31,023 5,026 13,982
Purchases, asset [3] 68,295 116,175 51,644
Sales, asset (15,041) (9,100) (9,465)
Settlements, asset [4] (15,400) (9,559) (48,558)
Transfers in and/or out of Level 3 (net), asset 6,818 0 0
Ending Balance, asset 319,297 243,602 141,060
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 12,918 3,458 2,445
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 18,018 1,713 7,116
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 3,331 3,053 2,761
Gains or losses (realized/ unrealized), included in earnings, asset [1] (75) 0 0
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 866 278 292
Gains or losses (realized/ unrealized), asset, total 791 278 292
Purchases, asset [3] 0 0 0
Sales, asset 0 0 0
Settlements, asset [4] (18) 0 0
Transfers in and/or out of Level 3 (net), asset 6,818 0 0
Ending Balance, asset 10,922 3,331 3,053
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (75) 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] 809 278 291
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 4,737 697 1,021
Gains or losses (realized/ unrealized), included in earnings, asset [1] 974 89 0
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 1 (1) (1)
Gains or losses (realized/ unrealized), asset, total 975 88 (1)
Purchases, asset [3] 14 5,922 0
Sales, asset 0 (1,554) 0
Settlements, asset [4] (140) (416) (323)
Transfers in and/or out of Level 3 (net), asset 0 0 0
Ending Balance, asset 5,586 4,737 697
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 608 (16) 0
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 1 0 (1)
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 0    
Gains or losses (realized/ unrealized), included in earnings, asset [1] 0    
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 286    
Gains or losses (realized/ unrealized), asset, total 286    
Purchases, asset [3] 6,879    
Sales, asset 0    
Settlements, asset [4] 0    
Transfers in and/or out of Level 3 (net), asset 0    
Ending Balance, asset 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    
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 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 235,534 137,310 129,675
Gains or losses (realized/ unrealized), included in earnings, asset [1] 13,007 3,699 7,041
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 15,964 961 6,650
Gains or losses (realized/ unrealized), asset, total 28,971 4,660 13,691
Purchases, asset [3] 61,402 110,253 51,644
Sales, asset (15,041) (7,546) (9,465)
Settlements, asset [4] (15,242) (9,143) (48,235)
Transfers in and/or out of Level 3 (net), asset 0 0 0
Ending Balance, asset 295,624 235,534 137,310
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 12,385 3,474 2,445
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 16,926 1,435 6,826
Fair Value, Measurements, Recurring | Level 3 | Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance, asset 143,074 112,972 91,410
Gains or losses (realized/ unrealized), included in earnings, asset [1] (841) 22,823 16,350
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 18,617 9,647 8,779
Gains or losses (realized/ unrealized), asset, total 17,776 32,470 25,129
Purchases, asset [3] 4,675 7,191 24,606
Sales, asset (495) (7,223) (26,795)
Settlements, asset [4] (2,173) (2,336) (768)
Transfers in and/or out of Level 3 (net), asset 0 0 (610)
Ending Balance, asset 162,857 143,074 112,972
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (1,097) 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] 18,617 9,514 8,743
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 143,074 112,972 91,410
Gains or losses (realized/ unrealized), included in earnings, asset [1] (841) 22,823 16,350
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 18,617 9,647 8,779
Gains or losses (realized/ unrealized), asset, total 17,776 32,470 25,129
Purchases, asset [3] 4,675 7,191 24,606
Sales, asset (495) (7,223) (26,795)
Settlements, asset [4] (2,173) (2,336) (768)
Transfers in and/or out of Level 3 (net), asset 0 0 (610)
Ending Balance, asset 162,857 143,074 112,972
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (1,097) 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] 18,617 9,514 8,743
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 (7,824) (3,772) 13,790
Gains or losses (realized/ unrealized), included in earnings, asset [1] 10,595 (2,845) (18,340)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (487) (1,207) 778
Gains or losses (realized/ unrealized), asset, total 10,108 (4,052) (17,562)
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 2,284 (7,824) (3,772)
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 10,595 (2,845) (18,340)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (487) (1,207) 778
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 (7,824) (3,772) 13,790
Gains or losses (realized/ unrealized), included in earnings, asset [1] 10,595 (2,845) (18,340)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] (487) (1,207) 778
Gains or losses (realized/ unrealized), asset, total 10,108 (4,052) (17,562)
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 2,284 (7,824) (3,772)
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] 10,595 (2,845) (18,340)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (487) (1,207) 778
Fair Value, Measurements, Recurring | Level 3 | Other assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance, asset 4,676 5,214 6,297
Gains or losses (realized/ unrealized), included in earnings, asset [1] (2,711) (1,286) (2,146)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 0 0 0
Gains or losses (realized/ unrealized), asset, total (2,711) (1,286) (2,146)
Purchases, asset [3] 971 1,153 1,835
Sales, asset 0 0 0
Settlements, asset [4] (150) (405) (772)
Transfers in and/or out of Level 3 (net), asset 0 0 0
Ending Balance, asset 2,786 4,676 5,214
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (2,711) (1,286) (2,146)
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] 4,676 5,214 6,297
Gains or losses (realized/ unrealized), included in earnings, asset [1],[5] (2,711) (1,286) (2,146)
Gains or losses (realized/ unrealized), included in other comprehensive income, asset [2] 0 [5] 0 [5] 0 [1]
Gains or losses (realized/ unrealized), asset, total [5] (2,711) (1,286) (2,146)
Purchases, asset [3],[5] 971 1,153 1,835
Sales, asset [5] 0 0 0
Settlements, asset [4],[5] (150) (405) (772)
Transfers in and/or out of Level 3 (net), asset [5] 0 0 0
Ending Balance, asset [5] 2,786 4,676 5,214
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1],[5] (2,711) (1,286) (2,146)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] 0 [5] 0 [5] 0 [1]
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 163,734 198,905 266,422
Gains or losses (realized/ unrealized), included in earnings, liability [1] (30,205) 6,343 (1,743)
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2] (265) 74 (467)
Gains or losses (realized/ unrealized), liability, total (30,470) 6,417 (2,210)
Purchases, liability [3] 0 0 0
Sales, liability 0 0 0
Settlements, liability [4] (26,997) (28,754) (69,727)
Transfers in and/or out of Level 3 (net), liability 0 0 0
Ending Balance, liability 167,207 163,734 198,905
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1] (30,205) 6,343 (1,743)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (265) 74 (467)
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] 163,734 198,905 266,422
Gains or losses (realized/ unrealized), included in earnings, liability [1],[6] (30,205) 6,343 (1,743)
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2],[6] (265) 74 (467)
Gains or losses (realized/ unrealized), liability, total [6] (30,470) 6,417 (2,210)
Purchases, liability [3],[6] 0 0 0
Sales, liability [6] 0 0 0
Settlements, liability [4] (26,997) [6] (28,754) [6] (69,727) [5]
Transfers in and/or out of Level 3 (net), liability [6] 0 0 0
Ending Balance, liability [6] 167,207 163,734 198,905
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period [1],[6] (30,205) 6,343 (1,743)
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2],[6] (265) 74 ¥ (467)
Fair Value, Measurements, Recurring | Level 3 | Accounts Payable      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance, liability 12,576    
Gains or losses (realized/ unrealized), included in earnings, liability [1] (47)    
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2] (1,513)    
Gains or losses (realized/ unrealized), liability, total (1,560)    
Purchases, liability [3] 0    
Sales, liability 0    
Settlements, liability [4] 0    
Transfers in and/or out of Level 3 (net), liability 0    
Ending Balance, liability 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] (47)    
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] (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 12,576    
Gains or losses (realized/ unrealized), included in earnings, liability [1] (47)    
Gains or losses (realized/ unrealized), included in other comprehensive income, liability [2] (1,513)    
Gains or losses (realized/ unrealized), liability, total (1,560)    
Purchases, liability [3] 0    
Sales, liability 0    
Settlements, liability [4] 0    
Transfers in and/or out of Level 3 (net), liability 0    
Ending Balance, liability 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] (47)    
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period [2] ¥ (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 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 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.