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Servicing of Financial Assets (Analysis Of Residential Mortgage Servicing Rights Under The Fair Value Measurement Method) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying value, beginning of period     $ 296  
Carrying value, end of period $ 392   392  
Residential Mortgage [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying value, beginning of period 401 $ 254 296 $ 345
Additions 45 24 77 35
Increase (decrease) in fair value, due to change in valuation inputs or assumptions (38) (11) 52 (94)
Increase (decrease) in fair value, economic amortization associated with borrower repayments [1] (16) (18) (33) (37)
Carrying value, end of period $ 392 $ 249 $ 392 $ 249
[1] "Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns. Regions' MSR decay methodology is a discounted net cash flow approach.