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Loans and the Allowance for Credit Losses (Schedule of Aging Analysis Of Days Past Due (DPD) For Each Portfolio Class) (Details) - USD ($) $ in Millions	Jun. 30, 2021		Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	$ 178		$ 221
Total Accrual	83,408		84,521
Nonaccrual	666		745
Loans, net of unearned income	84,074	[1]	85,266
Financing Receivable, Total 30 Days for more past due	391		554
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	4		7
Total Accrual	42,156		42,452
Nonaccrual	472		418
Loans, net of unearned income	42,628		42,870
Financing Receivable, Total 30 Days for more past due	39		66
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	2		1
Total Accrual	5,305		5,308
Nonaccrual	76		97
Loans, net of unearned income	5,381		5,405
Financing Receivable, Total 30 Days for more past due	9		6
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0		0
Total Accrual	235		291
Nonaccrual	10		9
Loans, net of unearned income	245		300
Financing Receivable, Total 30 Days for more past due	0		1
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	6		8
Total Accrual	47,696		48,051
Nonaccrual	558		524
Loans, net of unearned income	48,254		48,575
Financing Receivable, Total 30 Days for more past due	48		73
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0		0
Total Accrual	5,445		5,280
Nonaccrual	4		114
Loans, net of unearned income	5,449		5,394
Financing Receivable, Total 30 Days for more past due	4		3
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0		0
Total Accrual	1,799		1,869
Nonaccrual	0		0
Loans, net of unearned income	1,799		1,869
Financing Receivable, Total 30 Days for more past due	0		0
Total Investor Real Estate [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0		0
Total Accrual	7,244		7,149
Nonaccrual	4		114
Loans, net of unearned income	7,248		7,263
Financing Receivable, Total 30 Days for more past due	4		3
Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	119		156
Total Accrual	17,000		16,522
Nonaccrual	51		53
Loans, net of unearned income	17,051		16,575
Financing Receivable, Total 30 Days for more past due	216		301
Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	21		19
Total Accrual	4,012		4,493
Nonaccrual	45		46
Loans, net of unearned income	4,057		4,539
Financing Receivable, Total 30 Days for more past due	39		54
Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	13		13
Total Accrual	2,580		2,705
Nonaccrual	8		8
Loans, net of unearned income	2,588		2,713
Financing Receivable, Total 30 Days for more past due	23		30
Indirect-vehicles [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	2		4
Total Accrual	621		934
Nonaccrual	0		0
Loans, net of unearned income	621		934
Financing Receivable, Total 30 Days for more past due	11		23
Indirect-other consumer [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	3		5
Total Accrual	2,157		2,431
Nonaccrual	0		0
Loans, net of unearned income	2,157		2,431
Financing Receivable, Total 30 Days for more past due	15		25
Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	12		14
Total Accrual	1,131		1,213
Nonaccrual	0		0
Loans, net of unearned income	1,131		1,213
Financing Receivable, Total 30 Days for more past due	23		28
Other consumer
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	2		2
Total Accrual	967		1,023
Nonaccrual	0		0
Loans, net of unearned income	967		1,023
Financing Receivable, Total 30 Days for more past due	12		17
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	172		213
Total Accrual	28,468		29,321
Nonaccrual	104		107
Loans, net of unearned income	28,572		29,428
Financing Receivable, Total 30 Days for more past due	339		478
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	66		103
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	11		22
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	2		1
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	13		23
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Total Investor Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	30		41
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	6		11
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	3		7
Financial Asset, 60 to 89 Days Past Due [Member] | Indirect-vehicles [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	2		4
Financial Asset, 60 to 89 Days Past Due [Member] | Indirect-other consumer [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	5		8
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	5		6
Financial Asset, 60 to 89 Days Past Due [Member] | Other consumer
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	2		3
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	53		80
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	147		230
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	24		37
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	5		4
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0		1
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	29		42
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	4		3
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0		0
Financial Asset, 30 to 59 Days Past Due [Member] | Total Investor Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	4		3
Financial Asset, 30 to 59 Days Past Due [Member] | Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	67		104
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	12		24
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	7		10
Financial Asset, 30 to 59 Days Past Due [Member] | Indirect-vehicles [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	7		15
Financial Asset, 30 to 59 Days Past Due [Member] | Indirect-other consumer [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	7		12
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	6		8
Financial Asset, 30 to 59 Days Past Due [Member] | Other consumer
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	8		12
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	$ 114		$ 185
[1] These amounts consist of fees that are not allocated at the loan level and loans serviced by third parties wherein Regions does not receive FICO or vintage information.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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