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Servicing of Financial Assets (Tables)
3 Months Ended
Mar. 31, 2024
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 March 31
 20242023
 (In millions)
Carrying value, beginning of year$906 $812 
Additions
Purchases (1)
12510
Increase (decrease) in fair value(2):
Due to change in valuation inputs or assumptions19 (12)
Economic amortization associated with borrower repayments (3)
(29)(24)
Carrying value, end of year$1,026 $790 
_________
(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)Included in mortgage income. Amounts presented exclude offsetting impact from related derivatives.
(3)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): 
March 31
 20242023
 (Dollars in millions)
Unpaid principal balance$69,708 $54,557 
Weighted-average CPR (%)8.2 %7.7 %
Estimated impact on fair value of a 10% increase$(46)$(43)
Estimated impact on fair value of a 20% increase$(89)$(84)
Option-adjusted spread (basis points)486 546 
Estimated impact on fair value of a 10% increase$(22)$(19)
Estimated impact on fair value of a 20% increase$(44)$(38)
Weighted-average coupon interest rate3.7 %3.6 %
Weighted-average remaining maturity (months)302306
Weighted-average servicing fee (basis points)27.1 27.1