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Servicing of Financial Assets (Tables)
6 Months Ended
Jun. 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 June 30Six Months Ended June 30
 2023202220232022
 (In millions)
Carrying value, beginning of period$790 $542 $812 $418 
Additions10 12 29 
Purchases (1)
2218132 256 
Increase (decrease) in fair value:
Due to change in valuation inputs or assumptions52 (4)99 
Economic amortization associated with borrower repayments (2)
(27)(15)(51)(32)
Carrying value, end of period$801 $770 $801 $770 
_________
(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: 
June 30
 20232022
 (Dollars in millions)
Unpaid principal balance$55,277 $52,965 
Weighted-average CPR (%)8.1 %7.9 %
Estimated impact on fair value of a 10% increase$(42)$(66)
Estimated impact on fair value of a 20% increase$(79)$(107)
Option-adjusted spread (basis points)475 480 
Estimated impact on fair value of a 10% increase$(17)$(17)
Estimated impact on fair value of a 20% increase$(33)$(34)
Weighted-average coupon interest rate3.7 %3.4 %
Weighted-average remaining maturity (months)306309
Weighted-average servicing fee (basis points)27.2 27.1