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Goodwill and Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Mortgage Servicing Rights
Table 56: Mortgage Servicing Rights
 
Commercial MSRs
 
Residential MSRs
 
In millions
2019

2018

 
2019

2018

 
January 1
$
726

$
668

 
$
1,257

$
1,164

 
Additions:
 
 
 
 
 
 
From loans sold with servicing retained
29

39

 
23

35

 
Purchases
76

60

 
87

113

 
Changes in fair value due to:
 
 
 
 
 
 
Time and payoffs (a)
(110
)
(105
)
 
(117
)
(130
)
 
Other (b)
(126
)
104

 
(362
)
188

 
September 30
$
595

$
766

 
$
888

$
1,370

 
Related unpaid principal balance at September 30
$
203,808

$
174,664

 
$
122,886

$
127,099

 
Servicing advances at September 30
$
159

$
193

 
$
123

$
156

 
(a)
Represents decrease in MSR value due to passage of time, including the impact from both regularly scheduled loan principal payments and loans that were paid down or 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
Table 57: Commercial Mortgage Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30
2019

 
December 31
2018

 
Fair value
$
595

 
$
726

 
Weighted-average life (years)
4.0

 
4.1

 
Weighted-average constant prepayment rate
4.60
%
 
5.65
%
 
Decline in fair value from 10% adverse change
$
8

 
$
10

 
Decline in fair value from 20% adverse change
$
16

 
$
19

 
Effective discount rate
7.88
%
 
8.39
%
 
Decline in fair value from 10% adverse change
$
15

 
$
19

 
Decline in fair value from 20% adverse change
$
30

 
$
39

 
Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions
Table 58: Residential Mortgage Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30
2019

 
December 31
2018

 
Fair value
$
888

 
$
1,257

 
Weighted-average life (years)
4.3

 
6.9

 
Weighted-average constant prepayment rate
17.44
%
 
8.69
%
 
Decline in fair value from 10% adverse change
$
46

 
$
41

 
Decline in fair value from 20% adverse change
$
87

 
$
79

 
Weighted-average option adjusted spread
773

bps
806

bps
Decline in fair value from 10% adverse change
$
22

 
$
37

 
Decline in fair value from 20% adverse change
$
43

 
$
73