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 |
12 Months Ended |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
| Loans Held-for-Sale |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
|
¥ 67,794
|
¥ 96,566
|
¥ 173,849
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
(3,453)
|
(1,778)
|
566
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
2,679
|
(543)
|
18,937
|
| Gains or losses (realized/ unrealized), asset, total |
|
(774)
|
(2,321)
|
19,503
|
| Purchases, asset |
[3] |
77
|
633
|
4,467
|
| Sales, asset |
|
(714)
|
0
|
(66,078)
|
| Settlements, asset |
[4] |
(30,699)
|
(27,084)
|
(35,175)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
35,684
|
67,794
|
96,566
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
(1,221)
|
(708)
|
0
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
2,679
|
(543)
|
18,937
|
| Available-for-sale debt securities |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
|
217,654
|
319,297
|
243,602
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
22,401
|
1,336
|
13,906
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
(10,253)
|
(1,437)
|
17,117
|
| Gains or losses (realized/ unrealized), asset, total |
|
12,148
|
(101)
|
31,023
|
| Purchases, asset |
[3] |
138,155
|
99,785
|
68,295
|
| Sales, asset |
|
(1,335)
|
(56,749)
|
(15,041)
|
| Settlements, asset |
[4] |
(90,621)
|
(144,578)
|
(15,400)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
6,818
|
| Ending Balance, asset |
|
276,001
|
217,654
|
319,297
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
21,907
|
370
|
12,918
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
(8,224)
|
(463)
|
18,018
|
| 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
|
3,331
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
(198)
|
(107)
|
(75)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
618
|
82
|
866
|
| Gains or losses (realized/ unrealized), asset, total |
|
420
|
(25)
|
791
|
| Purchases, asset |
[3] |
0
|
0
|
0
|
| Sales, asset |
|
0
|
0
|
0
|
| Settlements, asset |
[4] |
(716)
|
(19)
|
(18)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
6,818
|
| Ending Balance, asset |
|
10,582
|
10,878
|
10,922
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
6
|
(107)
|
(75)
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
618
|
82
|
809
|
| 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
|
4,737
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
20,968
|
235
|
974
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
(12,004)
|
(17)
|
1
|
| Gains or losses (realized/ unrealized), asset, total |
|
8,964
|
218
|
975
|
| Purchases, asset |
[3] |
107,208
|
300
|
14
|
| Sales, asset |
|
0
|
(1,712)
|
0
|
| Settlements, asset |
[4] |
(2,233)
|
(140)
|
(140)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
118,191
|
4,252
|
5,586
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
20,968
|
(73)
|
608
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
(12,004)
|
(17)
|
1
|
| 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
|
0
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
0
|
0
|
0
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
59
|
(83)
|
286
|
| Gains or losses (realized/ unrealized), asset, total |
|
59
|
(83)
|
286
|
| Purchases, asset |
[3] |
0
|
0
|
6,879
|
| Sales, asset |
|
0
|
0
|
0
|
| Settlements, asset |
[4] |
(7,141)
|
0
|
0
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
0
|
7,082
|
7,165
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
0
|
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
|
(83)
|
282
|
| 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
|
235,534
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
1,631
|
1,208
|
13,007
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
1,074
|
(1,419)
|
15,964
|
| Gains or losses (realized/ unrealized), asset, total |
|
2,705
|
(211)
|
28,971
|
| Purchases, asset |
[3] |
30,947
|
99,485
|
61,402
|
| Sales, asset |
|
(1,335)
|
(55,037)
|
(15,041)
|
| Settlements, asset |
[4] |
(80,531)
|
(144,419)
|
(15,242)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
147,228
|
195,442
|
295,624
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
933
|
550
|
12,385
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
3,162
|
(445)
|
16,926
|
| Equity securities |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
|
162,210
|
162,857
|
143,074
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
85,324
|
(8,129)
|
(841)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
12,598
|
(2,089)
|
18,617
|
| Gains or losses (realized/ unrealized), asset, total |
|
97,922
|
(10,218)
|
17,776
|
| Purchases, asset |
[3] |
19,731
|
20,113
|
4,675
|
| Sales, asset |
|
(44,110)
|
(656)
|
(495)
|
| Settlements, asset |
[4] |
(5,157)
|
(9,886)
|
(2,173)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
230,596
|
162,210
|
162,857
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
85,082
|
(8,163)
|
(1,097)
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
¥ 12,579
|
(2,099)
|
18,617
|
| Fair Value, Asset, 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
|
|
|
| Equity securities | Investment funds, and others |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
|
¥ 162,210
|
162,857
|
143,074
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
85,324
|
(8,129)
|
(841)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
12,598
|
(2,089)
|
18,617
|
| Gains or losses (realized/ unrealized), asset, total |
|
97,922
|
(10,218)
|
17,776
|
| Purchases, asset |
[3] |
19,731
|
20,113
|
4,675
|
| Sales, asset |
|
(44,110)
|
(656)
|
(495)
|
| Settlements, asset |
[4] |
(5,157)
|
(9,886)
|
(2,173)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
230,596
|
162,210
|
162,857
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
85,082
|
(8,163)
|
(1,097)
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
12,579
|
(2,099)
|
18,617
|
| Derivative assets and liabilities (net) |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
|
8,165
|
2,284
|
(7,824)
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
(1,223)
|
5,480
|
10,595
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
488
|
401
|
(487)
|
| Gains or losses (realized/ unrealized), asset, total |
|
(735)
|
5,881
|
10,108
|
| 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 |
|
7,430
|
8,165
|
2,284
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
(1,223)
|
5,480
|
10,595
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
488
|
401
|
(487)
|
| 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
|
(7,824)
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
(1,223)
|
5,480
|
10,595
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
488
|
401
|
(487)
|
| Gains or losses (realized/ unrealized), asset, total |
|
(735)
|
5,881
|
10,108
|
| 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 |
|
7,430
|
8,165
|
2,284
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
(1,223)
|
5,480
|
10,595
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
488
|
401
|
(487)
|
| Other assets |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
|
2,586
|
2,786
|
4,676
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1] |
(2,167)
|
(1,027)
|
(2,711)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2] |
0
|
0
|
0
|
| Gains or losses (realized/ unrealized), asset, total |
|
(2,167)
|
(1,027)
|
(2,711)
|
| Purchases, asset |
[3] |
836
|
916
|
971
|
| Sales, asset |
|
0
|
0
|
0
|
| Settlements, asset |
[4] |
(92)
|
(89)
|
(150)
|
| Transfers in and/or out of Level 3 (net), asset |
|
0
|
0
|
0
|
| Ending Balance, asset |
|
1,163
|
2,586
|
2,786
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
(2,167)
|
(1,027)
|
(2,711)
|
| 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
|
| Other assets | Reinsurance recoverables |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, asset |
[5] |
2,586
|
2,786
|
4,676
|
| Gains or losses (realized/ unrealized), included in earnings, asset |
[1],[5] |
(2,167)
|
(1,027)
|
(2,711)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, asset |
[2],[5] |
0
|
0
|
0
|
| Gains or losses (realized/ unrealized), asset, total |
[5] |
(2,167)
|
(1,027)
|
(2,711)
|
| Purchases, asset |
[3],[5] |
836
|
916
|
971
|
| Sales, asset |
[5] |
0
|
0
|
0
|
| Settlements, asset |
[4],[5] |
(92)
|
(89)
|
(150)
|
| Transfers in and/or out of Level 3 (net), asset |
[5] |
0
|
0
|
0
|
| Ending Balance, asset |
[5] |
1,163
|
2,586
|
2,786
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1],[5] |
(2,167)
|
(1,027)
|
(2,711)
|
| 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
|
| 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
|
163,734
|
| Gains or losses (realized/ unrealized), included in earnings, liability |
[1] |
(25,594)
|
7,292
|
(30,205)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, liability |
[2] |
271
|
(48)
|
(265)
|
| Gains or losses (realized/ unrealized), liability, total |
|
(25,323)
|
7,244
|
(30,470)
|
| Purchases, liability |
[3] |
0
|
0
|
0
|
| Sales, liability |
|
0
|
0
|
0
|
| Settlements, liability |
[4] |
(23,553)
|
(23,706)
|
(26,997)
|
| Transfers in and/or out of Level 3 (net), liability |
|
0
|
0
|
0
|
| Ending Balance, liability |
|
138,027
|
136,257
|
167,207
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
(25,594)
|
7,292
|
(30,205)
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2] |
271
|
(48)
|
(265)
|
| 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
|
163,734
|
| Gains or losses (realized/ unrealized), included in earnings, liability |
[1],[6] |
(25,594)
|
7,292
|
(30,205)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, liability |
[2],[6] |
271
|
(48)
|
(265)
|
| Gains or losses (realized/ unrealized), liability, total |
[6] |
(25,323)
|
7,244
|
(30,470)
|
| Purchases, liability |
[3],[6] |
0
|
0
|
0
|
| Sales, liability |
[6] |
0
|
0
|
0
|
| Settlements, liability |
[4],[6] |
(23,553)
|
(23,706)
|
(26,997)
|
| Transfers in and/or out of Level 3 (net), liability |
[6] |
0
|
0
|
0
|
| Ending Balance, liability |
[6] |
138,027
|
136,257
|
167,207
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1],[6] |
(25,594)
|
7,292
|
(30,205)
|
| Change in unrealized gains or losses included in other comprehensive income for assets and liabilities still held at the end of period |
[2],[6] |
271
|
(48)
|
(265)
|
| Accounts Payable |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, liability |
|
15,259
|
14,136
|
12,576
|
| Gains or losses (realized/ unrealized), included in earnings, liability |
[1] |
3,029
|
(1,235)
|
(47)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, liability |
[2] |
(1,978)
|
112
|
(1,513)
|
| Gains or losses (realized/ unrealized), liability, total |
|
1,051
|
(1,123)
|
(1,560)
|
| Purchases, liability |
[3] |
1,475
|
0
|
0
|
| Sales, liability |
|
0
|
0
|
0
|
| Settlements, liability |
[4] |
0
|
0
|
0
|
| Transfers in and/or out of Level 3 (net), liability |
|
0
|
0
|
0
|
| Ending Balance, liability |
|
15,683
|
15,259
|
14,136
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
3,029
|
(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] |
¥ (1,978)
|
112
|
(1,513)
|
| Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
|
Revenues
|
|
|
| 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
|
|
|
| Accounts Payable | Contingent Consideration |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Beginning Balance, liability |
|
¥ 15,259
|
14,136
|
12,576
|
| Gains or losses (realized/ unrealized), included in earnings, liability |
[1] |
3,029
|
(1,235)
|
(47)
|
| Gains or losses (realized/ unrealized), included in other comprehensive income, liability |
[2] |
(1,978)
|
112
|
(1,513)
|
| Gains or losses (realized/ unrealized), liability, total |
|
1,051
|
(1,123)
|
(1,560)
|
| Purchases, liability |
[3] |
1,475
|
0
|
0
|
| Sales, liability |
|
0
|
0
|
0
|
| Settlements, liability |
[4] |
0
|
0
|
0
|
| Transfers in and/or out of Level 3 (net), liability |
|
0
|
0
|
0
|
| Ending Balance, liability |
|
15,683
|
15,259
|
14,136
|
| Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |
[1] |
3,029
|
(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] |
¥ (1,978)
|
¥ 112
|
¥ (1,513)
|
|
|