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Regulatory Capital Requirements and Restrictions (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Regions Financial Corporation [Member] |  |
Basel III Common Equity Tier 1 Capital |  |
Basel III common equity Tier 1, Amount | $ 12,976 | $ 12,066
Basel III common equity Tier 1, Ratio | 0.1026 | 0.0960
Tier One Risk Based Capital |  |
Tier 1 Capital, Amount | $ 14,635 | $ 13,725
Tier 1 Capital, Ratio | 0.1157 | 0.1091
Total Capital |  |
Total Capital, Amount | $ 16,885 | $ 15,767
Total Capital, Ratio | 0.1335 | 0.1254
Leverage Capital |  |
Leverage, Amount | $ 14,635 | $ 13,725
Leverage, Ratio | 0.0972 | 0.0890
Regions Bank [Member] |  |
Basel III Common Equity Tier 1 Capital |  |
Basel III common equity Tier 1, Amount | $ 14,136 | $ 13,509
Basel III common equity Tier 1, Ratio | 0.1122 | 0.1077
Tier One Risk Based Capital |  |
Tier 1 Capital, Amount | $ 14,136 | $ 13,509
Tier 1 Capital, Ratio | 0.1122 | 0.1077
Total Capital |  |
Total Capital, Amount | $ 16,057 | $ 15,172
Total Capital, Ratio | 0.1274 | 0.1210
Leverage Capital |  |
Leverage, Amount | $ 14,136 | $ 13,509
Leverage, Ratio | 0.0944 | 0.0880
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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