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Goodwill and Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Mortgage Servicing Rights
Table 59: Mortgage Servicing Rights
 
Commercial MSRs
 
Residential MSRs
 
In millions
2018

2017

 
2018

2017

 
January 1
$
668

$
576

 
$
1,164

$
1,182

 
Additions:
 
 
 
 
 
 
From loans sold with servicing retained
39

65

 
35

42

 
Purchases
60

48

 
113

172

 
Changes in fair value due to:
 
 
 
 
 
 
Time and payoffs (a)
(105
)
(81
)
 
(130
)
(130
)
 
Other (b)
104

20

 
188

(40
)
 
September 30
$
766

$
628

 
$
1,370

$
1,226

 
Related unpaid principal balance at September 30
$
174,664

$
153,059

 
$
127,099

$
129,210

 
Servicing advances at September 30
$
193

$
240

 
$
156

$
222

 
(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 60: Commercial Mortgage Loan Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30
2018

 
December 31
2017

 
Fair value
$
766

 
$
668

 
Weighted-average life (years)
4.2

 
4.4

 
Weighted-average constant prepayment rate
6.36
%
 
8.51
%
 
Decline in fair value from 10% adverse change
$
10

 
$
12

 
Decline in fair value from 20% adverse change
$
20

 
$
23

 
Effective discount rate
8.61
%
 
7.81
%
 
Decline in fair value from 10% adverse change
$
21

 
$
18

 
Decline in fair value from 20% adverse change
$
42

 
$
36

 
Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions
Table 61: Residential Mortgage Loan Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30
2018

 
December 31
2017

 
Fair value
$
1,370

 
$
1,164

 
Weighted-average life (years)
7.2

 
6.4

 
Weighted-average constant prepayment rate
8.13
%
 
10.04
%
 
Decline in fair value from 10% adverse change
$
39

 
$
44

 
Decline in fair value from 20% adverse change
$
75

 
$
85

 
Weighted-average option adjusted spread
820

bps
830

bps
Decline in fair value from 10% adverse change
$
41

 
$
35

 
Decline in fair value from 20% adverse change
$
80

 
$
67