v3.22.0.1
Servicing of Financial Assets (Tables)
 12 Months Ended
Dec. 31, 2021
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 for the years ended December 31: 
 202120202019
 (In millions)
Carrying value, beginning of year$296 $345 $418 
Additions149 108 42 
Increase (decrease) in fair value:
Due to change in valuation inputs or assumptions43 (89)(62)
Economic amortization associated with borrower repayments (1)
(70)(68)(53)
Carrying value, end of year$418 $296 $345 
_________
(1)"Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns. In the first quarter of 2020, Regions revised its MSR decay methodology from a passage of time approach to a discounted net cash flow approach. The change in methodology results in shifts between decay and hedge impacts, but does not impact the overall valuation.
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) as of December 31 are as follows: 
 20212020
 (Dollars in millions)
Unpaid principal balance$36,769 $34,454 
Weighted-average CPR (%)10.5 %15.6 %
Estimated impact on fair value of a 10% increase$(29)$(23)
Estimated impact on fair value of a 20% increase$(52)$(42)
Option-adjusted spread (basis points)451 560 
Estimated impact on fair value of a 10% increase$(8)$(7)
Estimated impact on fair value of a 20% increase$(16)$(13)
Weighted-average coupon interest rate3.5 %3.9 %
Weighted-average remaining maturity (months)295287
Weighted-average servicing fee (basis points)27.3 27.5 
Schedule Of Fees Resulting From The Servicing Of Residential Mortgage Loans
The following table presents servicing related fees, which includes contractually specified servicing fees, late fees and other ancillary income resulting from the servicing of residential mortgage loans for the years ended December 31:
 202120202019
 (In millions)
Servicing related fees and other ancillary income$102 $95 $102 
Servicing Asset at Amortized Cost
The table below presents an analysis of commercial MSRs under the amortization measurement method:
202120202019
(In millions)
Carrying value, beginning of the year$74 $59 $56 
Additions29 25 13 
Economic amortization associated with borrower repayments (1)
(17)(10)(10)
Carrying value, end of the year$86 $74 $59 
________
(1)Economic amortization associated with borrower repayments includes both total loan payoffs as well as partial paydowns.
servicing related fee for commercial
The following table presents servicing related fees, which includes contractually specified servicing fees, late fees and other ancillary income resulting from the servicing of DUS commercial mortgage loans for the years ended December 31:
202120202019
(In millions)
Servicing related fees and other ancillary income$25 $19 $16