Derivative Financial Instruments (Protection Sold Through Credit Default Swaps) (Detail) - JPY (¥)
¥ in Millions |
Mar. 31, 2022 |
Mar. 31, 2021 |
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
¥ 643,285
|
¥ 517,053
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
2,982,687
|
3,130,734
|
| Maximum potential/Notional amount, Expiring over 5 years |
836,239
|
805,026
|
| Maximum potential/Notional amount, Total |
4,462,211
|
4,452,813
|
| Credit derivative (asset) liability at fair value |
(72,915)
|
(69,286)
|
| Protection sold |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
643,285
|
517,053
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
2,982,687
|
3,114,128
|
| Maximum potential/Notional amount, Expiring over 5 years |
836,239
|
805,026
|
| Maximum potential/Notional amount, Total |
4,462,211
|
4,436,207
|
| Credit derivative (asset) liability at fair value |
(72,915)
|
(69,343)
|
| Protection sold | Single name credit default swaps: |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
499,442
|
379,092
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
2,224,643
|
2,548,775
|
| Maximum potential/Notional amount, Expiring over 5 years |
798,398
|
775,041
|
| Maximum potential/Notional amount, Total |
3,522,483
|
3,702,908
|
| Credit derivative (asset) liability at fair value |
(55,930)
|
(62,506)
|
| Protection sold | Single name credit default swaps: | Investment grade |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
408,281
|
294,312
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
1,874,796
|
2,235,390
|
| Maximum potential/Notional amount, Expiring over 5 years |
731,946
|
715,896
|
| Maximum potential/Notional amount, Total |
3,015,023
|
3,245,598
|
| Credit derivative (asset) liability at fair value |
(61,308)
|
(67,707)
|
| Protection sold | Single name credit default swaps: | Non-investment grade |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
91,161
|
84,780
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
349,847
|
311,702
|
| Maximum potential/Notional amount, Expiring over 5 years |
66,452
|
59,145
|
| Maximum potential/Notional amount, Total |
507,460
|
455,627
|
| Credit derivative (asset) liability at fair value |
5,378
|
5,284
|
| Protection sold | Single name credit default swaps: | Not rated |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
0
|
0
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
0
|
1,683
|
| Maximum potential/Notional amount, Expiring over 5 years |
0
|
0
|
| Maximum potential/Notional amount, Total |
0
|
1,683
|
| Credit derivative (asset) liability at fair value |
0
|
(83)
|
| Protection sold | Index and basket credit default swaps: |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
143,843
|
137,961
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
758,044
|
565,353
|
| Maximum potential/Notional amount, Expiring over 5 years |
37,841
|
29,985
|
| Maximum potential/Notional amount, Total |
939,728
|
733,299
|
| Credit derivative (asset) liability at fair value |
(16,985)
|
(6,837)
|
| Protection sold | Index and basket credit default swaps: | Investment grade |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
67,600
|
43,000
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
458,153
|
470,063
|
| Maximum potential/Notional amount, Expiring over 5 years |
36,955
|
29,133
|
| Maximum potential/Notional amount, Total |
562,708
|
542,196
|
| Credit derivative (asset) liability at fair value |
(9,604)
|
(4,753)
|
| Protection sold | Index and basket credit default swaps: | Non-investment grade |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
56,299
|
35,427
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
19,936
|
65,319
|
| Maximum potential/Notional amount, Expiring over 5 years |
0
|
0
|
| Maximum potential/Notional amount, Total |
76,235
|
100,746
|
| Credit derivative (asset) liability at fair value |
(61)
|
(1,165)
|
| Protection sold | Index and basket credit default swaps: | Not rated |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
19,944
|
59,534
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
279,955
|
29,971
|
| Maximum potential/Notional amount, Expiring over 5 years |
886
|
852
|
| Maximum potential/Notional amount, Total |
300,785
|
90,357
|
| Credit derivative (asset) liability at fair value |
(7,320)
|
(919)
|
| Other credit derivatives sold | Investment grade |
|
|
| Credit Derivatives [Line Items] |
|
|
| Maximum potential/Notional amount, Expiring in 1 year or less |
0
|
0
|
| Maximum potential/Notional amount, Expiring in 1-5 years |
0
|
16,606
|
| Maximum potential/Notional amount, Expiring over 5 years |
0
|
0
|
| Maximum potential/Notional amount, Total |
0
|
16,606
|
| Credit derivative (asset) liability at fair value |
¥ 0
|
¥ 57
|