Loans And The Allowance For Credit Losses (Analysis Of The Allowance For Credit Losses By Portfolio Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	$ 1,556	$ 1,613
Provision for loan losses	101	123
Loan Losses:
Charge-offs	(151)	(145)
Recoveries	21	22
Recoveries	(130)	(123)
Allowance for loan losses, end of period	1,527	1,613
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	130	116
Provision (credit) for unfunded credit losses	(10)	1
Reserve for unfunded credit commitments, end of year	120	117
Allowance for credit losses	1,647	1,730
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	755	743
Provision for loan losses	105	49
Loan Losses:
Charge-offs	(88)	(59)
Recoveries	9	12
Recoveries	(79)	(47)
Allowance for loan losses, end of period	781	745
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	95	91
Provision (credit) for unfunded credit losses	(8)	0
Reserve for unfunded credit commitments, end of year	87	91
Allowance for credit losses	868	836
Investor Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	120	240
Provision for loan losses	(12)	18
Loan Losses:
Charge-offs	0	(22)
Recoveries	0	0
Recoveries	0	(22)
Allowance for loan losses, end of period	108	236
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	15	7
Provision (credit) for unfunded credit losses	(1)	1
Reserve for unfunded credit commitments, end of year	14	8
Allowance for credit losses	122	244
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	681	630
Provision for loan losses	8	56
Loan Losses:
Charge-offs	(63)	(64)
Recoveries	12	10
Recoveries	(51)	(54)
Allowance for loan losses, end of period	638	632
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	20	18
Provision (credit) for unfunded credit losses	(1)	0
Reserve for unfunded credit commitments, end of year	19	18
Allowance for credit losses	$ 657	$ 650

REGIONS FINANCIAL CORP 10-Q