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Regulatory Capital Requirements and Restrictions (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) $ in Millions | Dec. 31, 2022 USD ($) | Sep. 30, 2022 | Dec. 31, 2021 USD ($)
--- | --- | --- | ---
Leverage Capital |  |  |
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum | 0.0250 | 0.025 |
Regions Financial Corporation [Member] |  |  |
Basel III Common Equity Tier 1 Capital |  |  |
Basel III common equity Tier 1, Amount | $ 12,066 |  | $ 10,844
Basel III common equity Tier 1, Ratio | 0.0960 |  | 0.0957
Tier One Risk Based Capital |  |  |
Tier 1 Capital, Amount | $ 13,725 |  | $ 12,503
Tier 1 Capital, Ratio | 0.1091 |  | 0.1103
Total Capital |  |  |
Total Capital, Amount | $ 15,767 |  | $ 14,441
Total Capital, Ratio | 0.1254 |  | 0.1274
Leverage Capital |  |  |
Leverage, Amount | $ 13,725 |  | $ 12,503
Leverage, Ratio | 0.0890 |  | 0.0808
Regions Bank [Member] |  |  |
Basel III Common Equity Tier 1 Capital |  |  |
Basel III common equity Tier 1, Amount | $ 13,509 |  | $ 12,478
Basel III common equity Tier 1, Ratio | 0.1077 |  | 0.1105
Tier One Risk Based Capital |  |  |
Tier 1 Capital, Amount | $ 13,509 |  | $ 12,478
Tier 1 Capital, Ratio | 0.1077 |  | 0.1105
Total Capital |  |  |
Total Capital, Amount | $ 15,172 |  | $ 13,985
Total Capital, Ratio | 0.1210 |  | 0.1238
Leverage Capital |  |  |
Leverage, Amount | $ 13,509 |  | $ 12,478
Leverage, Ratio | 0.0880 |  | 0.0809
Standardized Approach [Member] | Regions Financial Corporation [Member] |  |  |
Basel III Common Equity Tier 1 Capital |  |  |
Basel III common equity Tier 1,Minimum Requirement | 0.0450 |  | 0.0450
Base III common equity, Tie 1, minimum requirement plus SCB | 7.00% |  | 7.00%
Tier One Risk Based Capital |  |  |
Tier 1 Capital, Minimum Requirement | 0.0600 |  | 0.0600
Tier 1 Capital, Minimum Requirement Plus SCB | 8.50% |  | 8.50%
Tier 1 Capital, To Be Well Capitalized | 0.0600 |  | 0.0600
Total Capital |  |  |
Total Capital, Minimum Requirement | 0.0800 |  | 0.0800
Total Capital, Minimum Requirement Plus SCB | 10.50% |  | 10.50%
Total Capital, To Be Well Capitalized | 0.1000 |  | 0.1000
Leverage Capital |  |  |
Leverage, Minimum Requirement | 0.0400 |  | 0.0400
Leverage, Minimum Requirement Plus SCB | 4.00% |  | 4.00%
Standardized Approach [Member] | Regions Bank [Member] |  |  |
Basel III Common Equity Tier 1 Capital |  |  |
Basel III common equity Tier 1,Minimum Requirement | 0.0450 |  | 0.0450
Base III common equity, Tie 1, minimum requirement plus SCB | 7.00% |  | 7.00%
Basel III common equity Tier 1, To Be Well Capitalized | 0.0650 |  | 0.0650
Tier One Risk Based Capital |  |  |
Tier 1 Capital, Minimum Requirement | 0.0600 |  | 0.0600
Tier 1 Capital, Minimum Requirement Plus SCB | 8.50% |  | 8.50%
Tier 1 Capital, To Be Well Capitalized | 0.0800 |  | 0.0800
Total Capital |  |  |
Total Capital, Minimum Requirement | 0.0800 |  | 0.0800
Total Capital, Minimum Requirement Plus SCB | 10.50% |  | 10.50%
Total Capital, To Be Well Capitalized | 0.1000 |  | 0.1000
Leverage Capital |  |  |
Leverage, Minimum Requirement | 0.0400 |  | 0.0400
Leverage, Minimum Requirement Plus SCB | 4.00% |  | 4.00%
Leverage, To Be Well Capitalized | 0.0500 |  | 0.0500

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- Definition Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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