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Regulatory Capital Requirements and Regulations (Tables) | 12 Months Ended
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Dec. 31, 2023
Banking and Thrift, Other Disclosure [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables summarize the applicable holding company and bank regulatory capital requirements:
| December 31, 2023(1) |  |  | Minimum Requirement |  | Minimum Requirement plus SCB (2) |  | To Be Well Capitalized
| Amount |  | Ratio |  |
| (Dollars in millions)
Common equity Tier 1 capital: |  |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 12,976 |  |  | 10.26 | % |  |  | 4.50 | % |  | 7.00 | % |  | N/A
Regions Bank | 14,136 |  |  | 11.22 |  |  |  | 4.50 |  |  | 7.00 |  |  | 6.50 | %
Tier 1 capital: |  |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 14,635 |  |  | 11.57 | % |  |  | 6.00 | % |  | 8.50 | % |  | 6.00 | %
Regions Bank | 14,136 |  |  | 11.22 |  |  |  | 6.00 |  |  | 8.50 |  |  | 8.00 |
Total capital: |  |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 16,885 |  |  | 13.35 | % |  |  | 8.00 | % |  | 10.50 | % |  | 10.00 | %
Regions Bank | 16,057 |  |  | 12.74 |  |  |  | 8.00 |  |  | 10.50 |  |  | 10.00 |
Leverage capital: |  |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 14,635 |  |  | 9.72 | % |  |  | 4.00 | % |  | 4.00 | % |  | N/A
Regions Bank | 14,136 |  |  | 9.44 |  |  |  | 4.00 |  |  | 4.00 |  |  | 5.00 | %
| December 31, 2022 |  | Minimum Requirement |  | Minimum Requirement plus SCB (2) |  | To Be Well Capitalized
| Amount |  | Ratio |  |
| (Dollars in millions)
Common equity Tier 1 capital: |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 12,066 |  |  | 9.60 | % |  | 4.50 | % |  | 7.00 | % |  | N/A
Regions Bank | 13,509 |  |  | 10.77 |  |  | 4.50 |  |  | 7.00 |  |  | 6.50 | %
Tier 1 capital: |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 13,725 |  |  | 10.91 | % |  | 6.00 | % |  | 8.50 | % |  | 6.00 | %
Regions Bank | 13,509 |  |  | 10.77 |  |  | 6.00 |  |  | 8.50 |  |  | 8.00 |
Total capital: |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 15,767 |  |  | 12.54 | % |  | 8.00 | % |  | 10.50 | % |  | 10.00 | %
Regions Bank | 15,172 |  |  | 12.10 |  |  | 8.00 |  |  | 10.50 |  |  | 10.00 |
Leverage capital: |  |  |  |  |  |  |  |  |
Regions Financial Corporation | $ | 13,725 |  |  | 8.90 | % |  | 4.00 | % |  | 4.00 | % |  | N/A
Regions Bank | 13,509 |  |  | 8.80 |  |  | 4.00 |  |  | 4.00 |  |  | 5.00 | %
_________ (1)The 2023 Basel III CET1 capital, Tier 1 capital, Total capital, and Leverage capital ratios are estimated (2)Reflects Regions' SCB of 2.50%. SCB does not apply to leverage capital ratios.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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