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Regulatory Capital Requirements and Restrictions | 12 Months Ended
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Dec. 31, 2023
Banking and Thrift, Other Disclosure [Abstract] |
Regulatory Capital Requirements and Restrictions | NOTE 12. REGULATORY CAPITAL REQUIREMENTS AND RESTRICTIONS Regions and Regions Bank are required to comply with regulatory capital requirements established by Federal and State banking agencies. These regulatory capital requirements involve quantitative measures of the Company’s assets, liabilities and selected off-balance sheet items, and also qualitative judgments by the regulators. Failure to meet minimum capital requirements can subject the Company to a series of increasingly restrictive regulatory actions. Under the Basel III Rules, Regions is designated as a standardized approach bank. Regions is a "Category IV" institution under the Federal Reserve's rules for tailoring enhanced prudential standards. Banking regulations identify five capital categories: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized. At December 31, 2023 and 2022, Regions and Regions Bank exceeded all current regulatory requirements, and were classified as "well-capitalized." Management believes that no events or changes have occurred subsequent to December 31, 2023 that would change this designation. Quantitative measures established by regulation to ensure capital adequacy require institutions to maintain minimum ratios of common equity Tier 1, Tier 1, and Total capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital to average tangible assets (the "Leverage" ratio). Federal banking agencies allowed a phase-in of the impact of CECL on regulatory capital. At December 31, 2021, the add-back to regulatory capital was calculated as the impact of initial adoption, adjusted for 25 percent of subsequent changes in the allowance. The amount is phased-in over a three-year period beginning in 2022. At December 31, 2023, the net impact of the add-back on CET1 was approximately $204 million or approximately 16 basis points. The add-back amounts will decrease by approximately $100 million each year, or approximately 8 basis points, in the first quarters of 2024 and 2025. Regions participates in supervisory stress testing conducted by the Federal Reserve and its SCB is currently floored at 2.5 percent. See Note 14 to the consolidated financial statements for further details regarding CCAR results. 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 The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(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 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1D Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1F + Details
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