Derivative Financial Instruments (Gains and Losses for Trading and Risk Management Derivatives (Not Designated as Hedging Instruments)) (Detail) - JPY (¥)
¥ in Billions |
12 Months Ended |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
¥ (147)
|
¥ (510)
|
¥ (593)
|
| Interest rate contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
51
|
70
|
(173)
|
| Foreign exchange contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(39)
|
(91)
|
(429)
|
| Equity contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(98)
|
(269)
|
30
|
| Credit derivatives |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(34)
|
(53)
|
15
|
| Other |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(27)
|
(167)
|
(36)
|
| Foreign exchange gains (losses)—net |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(45)
|
(80)
|
(434)
|
| Foreign exchange gains (losses)—net | Interest rate contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
0
|
0
|
0
|
| Foreign exchange gains (losses)—net | Foreign exchange contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(39)
|
(91)
|
(429)
|
| Foreign exchange gains (losses)—net | Equity contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
0
|
0
|
0
|
| Foreign exchange gains (losses)—net | Credit derivatives |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
0
|
0
|
0
|
| Foreign exchange gains (losses)—net | Other |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(6)
|
11
|
(5)
|
| Trading account profits (losses)—net |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(102)
|
(430)
|
(159)
|
| Trading account profits (losses)—net | Interest rate contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
51
|
70
|
(173)
|
| Trading account profits (losses)—net | Foreign exchange contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
0
|
0
|
0
|
| Trading account profits (losses)—net | Equity contracts |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(98)
|
(269)
|
30
|
| Trading account profits (losses)—net | Credit derivatives |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
(34)
|
(53)
|
15
|
| Trading account profits (losses)—net | Other |
|
|
|
| Derivative Instruments, Gain (Loss) [Line Items] |
|
|
|
| Total |
¥ (21)
|
¥ (178)
|
¥ (31)
|