v3.19.3.a.u2
Servicing of Financial Assets (Tables)
 12 Months Ended
Dec. 31, 2019
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: 
 
2019
 
2018
 
2017
 
(In millions)
Carrying value, beginning of year
$
418

 
$
336

 
$
324

Additions
42

 
111

 
64

Increase (decrease) in fair value:
 
 
 
 
 
Due to change in valuation inputs or assumptions
(62
)
 
18

 
(8
)
Economic amortization associated with borrower repayments (1)
(53
)
 
(47
)
 
(44
)
Carrying value, end of year
$
345

 
$
418

 
$
336


_________
(1)
"Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns.
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: 
 
2019
 
2018
 
(Dollars in millions)
Unpaid principal balance
$
34,467

 
$
36,450

Weighted-average CPR (%)
12.0
%
 
9.0
%
Estimated impact on fair value of a 10% increase
$
(19
)
 
$
(24
)
Estimated impact on fair value of a 20% increase
$
(35
)
 
$
(43
)
Option-adjusted spread (basis points)
618

 
755

Estimated impact on fair value of a 10% increase
$
(8
)
 
$
(13
)
Estimated impact on fair value of a 20% increase
$
(16
)
 
$
(26
)
Weighted-average coupon interest rate
4.2
%
 
4.2
%
Weighted-average remaining maturity (months)
278

 
281

Weighted-average servicing fee (basis points)
27.3

 
27.1
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:
 
2019
 
2018
 
2017
 
(In millions)
Servicing related fees and other ancillary income
$
102

 
$
95

 
$
96