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Regulatory Capital Requirements and Restrictions (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) $ in Millions | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Regions Financial Corporation [Member] |  |
Basel III Common Equity Tier 1 Capital |  |
Basel III common equity Tier 1, Amount | $ 13,434 | $ 12,976
Basel III common equity Tier 1, Ratio | 0.1080 | 0.1026
Tier One Risk Based Capital |  |
Tier 1 Capital, Amount | $ 15,149 | $ 14,635
Tier 1 Capital, Ratio | 0.1217 | 0.1157
Total Capital |  |
Total Capital, Amount | $ 17,500 | $ 16,885
Total Capital, Ratio | 0.1406 | 0.1335
Leverage Capital |  |
Leverage, Amount | $ 15,149 | $ 14,635
Leverage, Ratio | 0.0988 | 0.0972
Regions Bank |  |
Basel III Common Equity Tier 1 Capital |  |
Basel III common equity Tier 1, Amount | $ 14,035 | $ 14,136
Basel III common equity Tier 1, Ratio | 0.1132 | 0.1122
Tier One Risk Based Capital |  |
Tier 1 Capital, Amount | $ 14,035 | $ 14,136
Tier 1 Capital, Ratio | 0.1132 | 0.1122
Total Capital |  |
Total Capital, Amount | $ 16,081 | $ 16,057
Total Capital, Ratio | 0.1297 | 0.1274
Leverage Capital |  |
Leverage, Amount | $ 14,035 | $ 14,136
Leverage, Ratio | 0.0921 | 0.0944
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 |  |
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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