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Goodwill and Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Mortgage Servicing Rights
Changes in the commercial and residential MSRs follow:

Table 54: Mortgage Servicing Rights
 Commercial MSRsResidential MSRs
In millions202320222023 2022
January 1 $1,113 $740 $2,310 $1,078 
Additions:
From loans sold with servicing retained38 52 17 49 
Purchases27 32 438 620 
Changes in fair value due to:
Time and payoffs (a)(247)(130)(176)(178)
Other (b)238 438 248 505 
September 30$1,169 $1,132 $2,837 $2,074 
Related unpaid principal balance of loans serviced at September 30$282,123 $281,931 $212,521 $169,678 
Servicing advances at September 30$507 $448 $121 $132 
(a)Represents decrease in MSR value due to passage of time, including the impact from regularly scheduled loan principal payments, prepayments and loans that were paid off during the period.
(b)Represents MSR value changes resulting primarily from market-driven changes in interest rates.
Commercial Mortgage Loan Servicing Assets - Key Valuation Assumptions The following tables set forth the fair value of commercial and residential MSRs and the sensitivity analysis of the hypothetical effect on the fair value of MSRs to immediate adverse changes of 10% and 20% in those assumptions:
Table 55: Commercial Mortgage Servicing Rights – Key Valuation Assumptions
Dollars in millionsSeptember 30, 2023December 31, 2022
Fair value$1,169 $1,113 
Weighted-average life (years)4.04.0
Weighted-average constant prepayment rate5.42 %4.28 %
Decline in fair value from 10% adverse change$9 $8 
Decline in fair value from 20% adverse change$18 $15 
Effective discount rate10.22 %9.77 %
Decline in fair value from 10% adverse change$36 $34 
Decline in fair value from 20% adverse change$73 $68 
Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions The following tables set forth the fair value of commercial and residential MSRs and the sensitivity analysis of the hypothetical effect on the fair value of MSRs to immediate adverse changes of 10% and 20% in those assumptions:
Table 56: Residential Mortgage Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30, 2023 December 31, 2022 
Fair value$2,837  $2,310  
Weighted-average life (years)8.4 8.0 
Weighted-average constant prepayment rate5.77 %6.72 %
Decline in fair value from 10% adverse change$58  $55  
Decline in fair value from 20% adverse change$112  $107  
Weighted-average option adjusted spread765 bps766 bps
Decline in fair value from 10% adverse change$89  $69  
Decline in fair value from 20% adverse change$173  $134