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Regulatory Capital Requirements and Regulations (Tables)
 12 Months Ended
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
 AmountRatio
(Dollars in millions)
Common equity Tier 1 capital:
Regions Financial Corporation$12,976 10.26 %4.50 %7.00 %N/A
Regions Bank14,136 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 Bank14,136 11.22 6.00 8.50 8.00 
Total capital:
Regions Financial Corporation$16,885 13.35 %8.00 %10.50 %10.00 %
Regions Bank16,057 12.74 8.00 10.50 10.00 
Leverage capital:
Regions Financial Corporation$14,635 9.72 %4.00 %4.00 %N/A
Regions Bank14,136 9.44 4.00 4.00 5.00 %
 December 31, 2022Minimum Requirement
Minimum Requirement plus SCB (2)
To Be Well
Capitalized
 AmountRatio
(Dollars in millions)
Common equity Tier 1 capital:
Regions Financial Corporation$12,066 9.60 %4.50 %7.00 %N/A
Regions Bank13,509 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 Bank13,509 10.77 6.00 8.50 8.00 
Total capital:
Regions Financial Corporation$15,767 12.54 %8.00 %10.50 %10.00 %
Regions Bank15,172 12.10 8.00 10.50 10.00 
Leverage capital:
Regions Financial Corporation$13,725 8.90 %4.00 %4.00 %N/A
Regions Bank13,509 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.