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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.