Loans and Allowance for Credit Losses (Troubled Debt Restructurings by Class) (Detail) - JPY (¥)
|
12 Months Ended |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
¥ 265,569,000,000
|
¥ 178,416,000,000
|
¥ 217,911,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
263,450,000,000
|
177,246,000,000
|
216,599,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
38,521,000,000
|
39,450,000,000
|
26,521,000,000
|
| Commercial | Loans acquired with deteriorated credit quality |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
0
|
0
|
10,786,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
0
|
0
|
10,786,000,000
|
| Commercial | Domestic |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
168,348,000,000
|
39,282,000,000
|
61,735,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
167,342,000,000
|
39,282,000,000
|
61,735,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
12,020,000,000
|
16,179,000,000
|
8,857,000,000
|
| Commercial | Foreign |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
16,144,000,000
|
33,839,000,000
|
39,827,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
16,144,000,000
|
33,839,000,000
|
39,827,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
13,180,000,000
|
9,861,000,000
|
2,337,000,000
|
| Residential |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
22,484,000,000
|
18,121,000,000
|
5,137,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
22,484,000,000
|
18,121,000,000
|
5,137,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
203,000,000
|
157,000,000
|
31,000,000
|
| Card |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
20,937,000,000
|
20,857,000,000
|
22,625,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
19,824,000,000
|
19,737,000,000
|
21,561,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
2,746,000,000
|
2,733,000,000
|
3,320,000,000
|
| MUAH |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
11,384,000,000
|
22,801,000,000
|
33,782,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
11,384,000,000
|
22,763,000,000
|
33,564,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
0
|
3,437,000,000
|
4,656,000,000
|
| Krungsri |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
14,869,000,000
|
18,548,000,000
|
31,238,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
14,869,000,000
|
18,548,000,000
|
31,209,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
5,657,000,000
|
6,226,000,000
|
7,305,000,000
|
| Other |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Troubled debt restructurings, Pre-modification outstanding recorded investment |
11,403,000,000
|
24,968,000,000
|
12,781,000,000
|
| Troubled debt restructurings, Post-modification outstanding recorded investment |
11,403,000,000
|
24,956,000,000
|
12,780,000,000
|
| Troubled debt restructurings that subsequently defaulted, Recorded Investment |
¥ 4,715,000,000
|
¥ 857,000,000
|
¥ 15,000,000
|