Debt Securities in Issue - Summary of Debt Securities in Issue (Detail) - JPY (¥)
¥ in Millions |
12 Months Ended |
|
Mar. 31, 2026 |
Mar. 31, 2025 |
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 16,576,423
|
¥ 14,387,415
|
| Sumitomo mitsui banking corporation [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 2,696,208
|
2,188,904
|
| Sumitomo mitsui banking corporation [member] | Subordinated bonds [Member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Japanese yen
|
|
| Debt securities in issue, Maturity year |
2026
|
|
| Debt securities in issue |
¥ 59,999
|
59,998
|
| Sumitomo mitsui banking corporation [member] | Subordinated bonds [Member] | Minimum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
2.17%
|
|
| Sumitomo mitsui banking corporation [member] | Subordinated bonds [Member] | Maximum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
2.21%
|
|
| Sumitomo mitsui banking corporation [member] | Commercial paper [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 2,237,882
|
1,819,529
|
| Sumitomo mitsui banking corporation [member] | Commercial paper [member] | Minimum [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
1.96%
|
|
| Sumitomo mitsui banking corporation [member] | Commercial paper [member] | Maximum [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
4.91%
|
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
United States dollars
|
|
| Debt securities in issue |
¥ 378,138
|
281,872
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Australian dollars
|
|
| Debt securities in issue |
¥ 12,030
|
5,838
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Hong Kong, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Hong Kong dollars
|
|
| Debt securities in issue |
¥ 8,159
|
21,667
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Minimum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
3.30%
|
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Minimum [member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2026
|
|
| Debt securities in issue, Interest rate |
4.77%
|
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Minimum [member] | Hong Kong, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
2.90%
|
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Maximum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2045
|
|
| Debt securities in issue, Interest rate |
6.90%
|
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Maximum [member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2027
|
|
| Debt securities in issue, Interest rate |
4.80%
|
|
| Sumitomo mitsui banking corporation [member] | Unsubordinated bonds [Member] | Maximum [member] | Hong Kong, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2028
|
|
| Debt securities in issue, Interest rate |
4.16%
|
|
| Other subsidiaries [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 2,745,934
|
2,682,046
|
| Other subsidiaries [member] | Subordinated bonds [Member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Japanese yen
|
|
| Debt securities in issue, Maturity year |
2028
|
|
| Debt securities in issue |
¥ 20,000
|
20,000
|
| Other subsidiaries [member] | Subordinated bonds [Member] | Minimum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
4.00%
|
|
| Other subsidiaries [member] | Subordinated bonds [Member] | Maximum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
4.15%
|
|
| Other subsidiaries [member] | Commercial paper [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 1,913,474
|
1,751,568
|
| Other subsidiaries [member] | Commercial paper [member] | Minimum [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
0.30%
|
|
| Other subsidiaries [member] | Commercial paper [member] | Maximum [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Interest rate |
7.97%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
United States dollars
|
|
| Debt securities in issue |
¥ 6,700
|
8,606
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
euros
|
|
| Debt securities in issue |
¥ 476,416
|
566,906
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Australian dollars
|
|
| Debt securities in issue |
¥ 183
|
250
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Japanese yen
|
|
| Debt securities in issue |
¥ 69,764
|
84,114
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Indonesia, Rupiahs [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Indonesian rupiah
|
|
| Debt securities in issue |
¥ 63,884
|
33,651
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Indian, Rupees [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Indian rupee
|
|
| Debt securities in issue |
¥ 195,513
|
216,951
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Minimum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
0.01%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Minimum [member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
0.01%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Minimum [member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2027
|
|
| Debt securities in issue, Interest rate |
0.01%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Minimum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
0.01%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Minimum [member] | Indonesia, Rupiahs [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
6.10%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Minimum [member] | Indian, Rupees [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
7.14%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Maximum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2037
|
|
| Debt securities in issue, Interest rate |
4.02%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Maximum [member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2031
|
|
| Debt securities in issue, Interest rate |
3.60%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Maximum [member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2028
|
|
| Debt securities in issue, Interest rate |
0.75%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Maximum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2050
|
|
| Debt securities in issue, Interest rate |
7.20%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Maximum [member] | Indonesia, Rupiahs [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2030
|
|
| Debt securities in issue, Interest rate |
7.45%
|
|
| Other subsidiaries [member] | Unsubordinated bonds [Member] | Maximum [member] | Indian, Rupees [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2035
|
|
| Debt securities in issue, Interest rate |
9.50%
|
|
| SMFG [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 11,134,281
|
9,516,465
|
| SMFG [member] | Subordinated bonds [Member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
United States dollars
|
|
| Debt securities in issue |
¥ 869,239
|
493,492
|
| SMFG [member] | Subordinated bonds [Member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
euros
|
|
| SMFG [member] | Subordinated bonds [Member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Australian dollars
|
|
| SMFG [member] | Subordinated bonds [Member] | Hong Kong, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Hong Kong dollars
|
|
| SMFG [member] | Subordinated bonds [Member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Currency payable in |
Japanese yen
|
|
| Debt securities in issue |
¥ 752,730
|
701,064
|
| SMFG [member] | Subordinated bonds [Member] | Minimum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2029
|
|
| Debt securities in issue, Interest rate |
2.14%
|
|
| SMFG [member] | Subordinated bonds [Member] | Minimum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
0.47%
|
|
| SMFG [member] | Subordinated bonds [Member] | Maximum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2045
|
|
| Debt securities in issue, Interest rate |
6.18%
|
|
| SMFG [member] | Subordinated bonds [Member] | Maximum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2035
|
|
| Debt securities in issue, Interest rate |
2.35%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 8,015,219
|
7,204,601
|
| SMFG [member] | Unsubordinated bonds [Member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
1,189,176
|
799,166
|
| SMFG [member] | Unsubordinated bonds [Member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 61,456
|
52,553
|
| SMFG [member] | Unsubordinated bonds [Member] | Hong Kong, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2028
|
|
| Debt securities in issue, Interest rate |
3.54%
|
|
| Debt securities in issue |
¥ 6,059
|
5,589
|
| SMFG [member] | Unsubordinated bonds [Member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue |
¥ 240,402
|
¥ 260,000
|
| SMFG [member] | Unsubordinated bonds [Member] | Minimum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2025
|
|
| Debt securities in issue, Interest rate |
0.95%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Minimum [member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2026
|
|
| Debt securities in issue, Interest rate |
0.30%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Minimum [member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2026
|
|
| Debt securities in issue, Interest rate |
3.40%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Minimum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2026
|
|
| Debt securities in issue, Interest rate |
0.55%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Maximum [member] | U.S. Dollar [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2052
|
|
| Debt securities in issue, Interest rate |
6.71%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Maximum [member] | Euro [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2035
|
|
| Debt securities in issue, Interest rate |
4.49%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Maximum [member] | Australia, Dollars [Member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2028
|
|
| Debt securities in issue, Interest rate |
4.13%
|
|
| SMFG [member] | Unsubordinated bonds [Member] | Maximum [member] | Japanese Yen [member] |
|
|
| Debt securities in issue [line items] |
|
|
| Debt securities in issue, Maturity year |
2035
|
|
| Debt securities in issue, Interest rate |
2.15%
|
|