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Servicing of Financial Assets (Tables)
9 Months Ended
Sep. 30, 2023
Transfers and Servicing of Financial Assets [Abstract]  
Schedule of Residential Mortgage Servicing Rights Under The Fair Value Measurement Method
The table below presents an analysis of residential MSRs under the fair value measurement method: 
Three Months Ended September 30Nine Months Ended September 30
 2023202220232022
 (In millions)
Carrying value, beginning of period$801 $770 $812 $418 
Additions20 38 
Purchases (1)
10625138 281 
Increase (decrease) in fair value:
Due to change in valuation inputs or assumptions45 28 41 127 
Economic amortization associated with borrower repayments (2)
(28)(23)(79)(55)
Carrying value, end of period$932 $809 $932 $809 
_________
(1)Purchases of residential MSRs can be structured with cash hold back provisions, therefore the timing of payment may be made in future periods.
(2)Includes both total loan payoffs as well as partial paydowns. Regions' MSR decay methodology is a discounted net cash flow approach.
Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To Mortgage Servicing Rights
Data and assumptions used in the fair value calculation, as well as the valuation’s sensitivity to rate fluctuations, related to residential MSRs (excluding related derivative instruments) are as follows: 
September 30
 20232022
 (Dollars in millions)
Unpaid principal balance$61,452 $53,947 
Weighted-average CPR (%)7.7 %7.6 %
Estimated impact on fair value of a 10% increase$(59)$(56)
Estimated impact on fair value of a 20% increase$(100)$(96)
Option-adjusted spread (basis points)483 479 
Estimated impact on fair value of a 10% increase$(20)$(17)
Estimated impact on fair value of a 20% increase$(40)$(35)
Weighted-average coupon interest rate3.7 %3.5 %
Weighted-average remaining maturity (months)303309
Weighted-average servicing fee (basis points)27.3 27.1