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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 - JPY (¥)
¥ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Transfers in and/or out of Level 3 (net), asset ¥ 0 ¥ 0   ¥ 0
Level 3 | Loans Held-for-Sale        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 173,281   ¥ 173,849  
Gains or losses (realized/ unrealized), included in earnings, asset 168   339  
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 4,064   18,249  
Gains or losses (realized/ unrealized), asset, total 4,232   18,588  
Purchases, asset 1,235   3,132  
Sales, asset (50,752)   (58,350)  
Settlements, asset (607)   (9,830)  
Transfers in and/or out of Level 3 (net), asset 0   0  
Ending Balance, asset 127,389   127,389  
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 162   140  
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 4,064   18,249  
Level 3 | Available-for-sale debt securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 268,397 176,919 243,602 141,060
Gains or losses (realized/ unrealized), included in earnings, asset 4,166 4,393 12,527 10,011 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 5,869 2,401 13,684 5,711 [2]
Gains or losses (realized/ unrealized), asset, total 10,035 6,794 26,211 15,722
Purchases, asset 12,830 13,190 21,976 47,361 [3]
Sales, asset (2,900) 0 (3,651) (5,678)
Settlements, asset (6,207) (1,898) (7,256) (3,460) [4]
Transfers in and/or out of Level 3 (net), asset 0 0 1,273 0
Ending Balance, asset 282,155 195,005 282,155 195,005
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 3,694 4,391 11,956 9,995 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 5,894 2,558 14,095 6,090 [2]
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 4,871 3,409 3,331 3,053
Gains or losses (realized/ unrealized), included in earnings, asset 0 0 (80) 0 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 154 203 501 559 [2]
Gains or losses (realized/ unrealized), asset, total 154 203 421 559
Purchases, asset 0 0 0 0 [3]
Sales, asset 0 0 0 0
Settlements, asset 0 0 0 0 [4]
Transfers in and/or out of Level 3 (net), asset 0 0 1,273 0
Ending Balance, asset 5,025 3,612 5,025 3,612
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 0 0 (80) 0 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 125 203 472 559 [2]
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 5,152 625 4,737 697
Gains or losses (realized/ unrealized), included in earnings, asset 249 0 719 0 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 0 0 0 (1) [2]
Gains or losses (realized/ unrealized), asset, total 249 0 719 (1)
Purchases, asset 0 0 14 0 [3]
Sales, asset 0 0 0 0
Settlements, asset (1) (275) (70) (346) [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset 5,400 350 5,400 350
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 156 0 539 0 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 0 0 0 0 [2]
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   0  
Gains or losses (realized/ unrealized), included in earnings, asset 0   0  
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 196   196  
Gains or losses (realized/ unrealized), asset, total 196   196  
Purchases, asset 6,879   6,879  
Sales, asset 0   0  
Settlements, asset 0   0  
Transfers in and/or out of Level 3 (net), asset 0   0  
Ending Balance, asset 7,075   7,075  
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 0   0  
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 0   0  
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 258,374 172,885 235,534 137,310
Gains or losses (realized/ unrealized), included in earnings, asset 3,917 4,393 11,888 10,011 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 5,519 2,198 12,987 5,153 [2]
Gains or losses (realized/ unrealized), asset, total 9,436 6,591 24,875 15,164
Purchases, asset 5,951 13,190 15,083 47,361 [3]
Sales, asset (2,900) 0 (3,651) (5,678)
Settlements, asset (6,206) (1,623) (7,186) (3,114) [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset 264,655 191,043 264,655 191,043
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 3,538 4,391 11,497 9,995 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 5,769 2,355 13,623 5,531 [2]
Level 3 | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 154,246 124,735 140,563 112,972
Gains or losses (realized/ unrealized), included in earnings, asset 868 2,539 2,383 3,874 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 4,956 6,881 17,036 19,692 [2]
Gains or losses (realized/ unrealized), asset, total 5,824 9,420 19,419 23,566
Purchases, asset 823 621 1,060 2,500 [3]
Sales, asset (401) (4,040) (401) (7,144)
Settlements, asset (361) (364) (510) (1,522) [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset 160,131 130,372 160,131 130,372
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 874 2,336 2,175 3,155 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 4,936 6,880 17,037 19,688 [2]
Level 3 | Equity securities | Investment funds, and others        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 154,246 124,735 140,563 112,972
Gains or losses (realized/ unrealized), included in earnings, asset 868 2,539 2,383 3,874 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 4,956 6,881 17,036 19,692 [2]
Gains or losses (realized/ unrealized), asset, total 5,824 9,420 19,419 23,566
Purchases, asset 823 621 1,060 2,500 [3]
Sales, asset (401) (4,040) (401) (7,144)
Settlements, asset (361) (364) (510) (1,522) [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset 160,131 130,372 160,131 130,372
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 874 2,336 2,175 3,155 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 4,936 6,880 17,037 19,688 [2]
Level 3 | Certain investment in affiliates        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 2,727   2,511  
Gains or losses (realized/ unrealized), included in earnings, asset 0   0  
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 147   363  
Gains or losses (realized/ unrealized), asset, total 147   363  
Purchases, asset 2,282   2,282  
Sales, asset 0   0  
Settlements, asset (153)   (153)  
Transfers in and/or out of Level 3 (net), asset 0   0  
Ending Balance, asset 5,003   5,003  
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 0   0  
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 147   363  
Level 3 | Derivative assets and liabilities (net)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset (4,716) (17,781) (7,824) (3,772)
Gains or losses (realized/ unrealized), included in earnings, asset 632 (5,681) 4,229 (18,486) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset (130) (1,377) (619) (2,581) [2]
Gains or losses (realized/ unrealized), asset, total 502 (7,058) 3,610 (21,067)
Purchases, asset 0 0 0 0 [3]
Sales, asset 0 0 0 0
Settlements, asset 0 0 0 0 [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset (4,214) (24,839) (4,214) (24,839)
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 632 (5,681) 4,229 (18,486) [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period (130) (1,377) (619) (2,581) [2]
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 (4,716) (17,781) (7,824) (3,772)
Gains or losses (realized/ unrealized), included in earnings, asset 632 (5,681) 4,229 (18,486) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset (130) (1,377) (619) (2,581) [2]
Gains or losses (realized/ unrealized), asset, total 502 (7,058) 3,610 (21,067)
Purchases, asset 0 0 0 0 [3]
Sales, asset 0 0 0 0
Settlements, asset 0 0 0 0 [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset (4,214) (24,839) (4,214) (24,839)
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 632 (5,681) 4,229 (18,486) [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period (130) (1,377) (619) (2,581) [2]
Level 3 | Other assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 3,876 5,732 4,676 5,214
Gains or losses (realized/ unrealized), included in earnings, asset (410) (216) (1,409) 121 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 0 0 0 0 [2]
Gains or losses (realized/ unrealized), asset, total (410) (216) (1,409) 121
Purchases, asset 250 321 500 632 [3]
Sales, asset 0 0 0 0
Settlements, asset (46) (135) (97) (265) [4]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0
Ending Balance, asset 3,670 5,702 3,670 5,702
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period (410) (216) (1,409) 121 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 0 0 0 0 [2]
Level 3 | Other assets | Reinsurance recoverables        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, asset 3,876 5,732 4,676 5,214 [5]
Gains or losses (realized/ unrealized), included in earnings, asset (410) (216) (1,409) 121 [1],[5]
Gains or losses (realized/ unrealized), included in other comprehensive income, asset 0 0 0 0 [2],[5]
Gains or losses (realized/ unrealized), asset, total (410) (216) (1,409) 121 [5]
Purchases, asset 250 321 500 632 [3],[5]
Sales, asset 0 0 0 0
Settlements, asset (46) (135) (97) (265) [4],[5]
Transfers in and/or out of Level 3 (net), asset 0 0 0 0 [5]
Ending Balance, asset 3,670 5,702 [5] 3,670 5,702 [5]
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period (410) (216) (1,409) 121 [1],[5]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period 0 0 0 0 [2],[5]
Level 3 | Policy liabilities and policy account balances        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance, liability 170,568 180,791 163,734 198,905
Gains or losses (realized/ unrealized), included in earnings, liability 3,028 2,204 (10,121) 11,679 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income, liability (110) 106 (170) 83 [2]
Gains or losses (realized/ unrealized), liability, total 2,918 2,310 (10,291) 11,762
Purchases, liability 0 0 0 0 [3]
Sales, liability 0 0 0 0
Settlements, liability (7,473) (8,304) (13,848) (16,966) [4]
Transfers in and/or out of Level 3 (net), liability 0 0 0 0
Ending Balance, liability 160,177 170,177 160,177 170,177
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 3,028 2,204 (10,121) 11,679 [1]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period (110) 106 (170) 83 [2]
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 170,568 180,791 163,734 198,905 [6]
Gains or losses (realized/ unrealized), included in earnings, liability 3,028 2,204 (10,121) 11,679 [1],[6]
Gains or losses (realized/ unrealized), included in other comprehensive income, liability (110) 106 (170) 83 [2],[6]
Gains or losses (realized/ unrealized), liability, total 2,918 2,310 (10,291) 11,762 [6]
Purchases, liability 0 0 0 0 [3],[6]
Sales, liability 0 0 0 0
Settlements, liability (7,473) (8,304) (13,848) (16,966) [4],[6]
Transfers in and/or out of Level 3 (net), liability 0 0 0 0 [6]
Ending Balance, liability 160,177 170,177 [6] 160,177 170,177 [6]
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 3,028 2,204 (10,121) 11,679 [1],[6]
Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period ¥ (110) ¥ 106 ¥ (170) ¥ 83 [2],[6]
[1] Principally, gains and losses from loans held for sale are included in “Revenues from interest on loans”, 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, certain investment in affiliates, 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.