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Employee Benefit Plans (Presentation Of The Fair Value Of Regions' Qualified Defined-Benefit Pension Plans' Financial Assets) (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,874,000,000	$ 1,936,000,000	$ 1,970,000,000
Defined Benefit Plan, Common Collective Trust | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	117,000,000	111,000,000
Defined Benefit Plan, Common Collective Trust | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	126,000,000	119,000,000
Defined Benefit Plan, Common Collective Trust | International Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	120,000,000	117,000,000
Collective Investment Trust Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	363,000,000	347,000,000
Fair Value Measured at Net Asset Value Per Share | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	119,000,000	144,000,000
Fair Value Measured at Net Asset Value Per Share | Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	172,000,000	167,000,000
Estimate of Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	1,220,000,000	1,278,000,000
Estimate of Fair Value [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	27,000,000	74,000,000
Estimate of Fair Value [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	979,000,000	969,000,000
Estimate of Fair Value [Member] | Fixed Income Securities [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	362,000,000	359,000,000
Estimate of Fair Value [Member] | Fixed Income Securities [Member] | Federal Agency Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	11,000,000	7,000,000
Estimate of Fair Value [Member] | Fixed Income Securities [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	606,000,000	603,000,000
Estimate of Fair Value [Member] | Equity Securities [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	124,000,000	132,000,000
Estimate of Fair Value [Member] | Mutual Funds [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	90,000,000	103,000,000
Estimate of Fair Value [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	603,000,000	668,000,000
Estimate of Fair Value [Member] | Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	27,000,000	74,000,000
Estimate of Fair Value [Member] | Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	362,000,000	359,000,000
Estimate of Fair Value [Member] | Level 1 [Member] | Fixed Income Securities [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	362,000,000	359,000,000
Estimate of Fair Value [Member] | Level 1 [Member] | Fixed Income Securities [Member] | Federal Agency Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 1 [Member] | Fixed Income Securities [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 1 [Member] | Equity Securities [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	124,000,000	132,000,000
Estimate of Fair Value [Member] | Level 1 [Member] | Mutual Funds [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	90,000,000	103,000,000
Estimate of Fair Value [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	617,000,000	610,000,000
Estimate of Fair Value [Member] | Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	617,000,000	610,000,000
Estimate of Fair Value [Member] | Level 2 [Member] | Fixed Income Securities [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 2 [Member] | Fixed Income Securities [Member] | Federal Agency Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	11,000,000	7,000,000
Estimate of Fair Value [Member] | Level 2 [Member] | Fixed Income Securities [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	606,000,000	603,000,000
Estimate of Fair Value [Member] | Level 2 [Member] | Equity Securities [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 2 [Member] | Mutual Funds [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Fixed Income Securities [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Fixed Income Securities [Member] | Federal Agency Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Fixed Income Securities [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Equity Securities [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	0	0
Estimate of Fair Value [Member] | Level 3 [Member] | Mutual Funds [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets, Fair Value	$ 0	$ 0

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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