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Goodwill and Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Mortgage Servicing Rights
Changes in the commercial and residential MSRs follow:

Table 55: Mortgage Servicing Rights
 
Commercial MSRs
 
Residential MSRs
 
In millions
2017

2016

 
2017

2016

 
January 1
$
576

$
526

 
$
1,182

$
1,063

 
Additions:
 
 
 
 
 
 
From loans sold with
    servicing retained
65

45

 
42

39

 
Purchases
48

25

 
172

154

 
Changes in fair value
    due to:
 
 
 
 
 
 
Time and payoffs (a)
(81
)
(67
)
 
(130
)
(120
)
 
Other (b)
20

(56
)
 
(40
)
(316
)
 
September 30
$
628

$
473

 
$
1,226

$
820

 
Related unpaid
    principal balance at
$
153,059

$
139,976

 
$
129,210

$
126,189

 
 September 30
Servicing advances at
$
240

$
251

 
$
222

$
322

 
September 30
(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
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: Commercial Mortgage Loan Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30
2017

 
December 31
2016

 
Fair value
$
628

 
$
576

 
Weighted-average life (years)
4.5

 
4.6

 
Weighted-average constant
    prepayment rate
8.48
%
 
8.61
%
 
Decline in fair value from 10%
    adverse change
$
12

 
$
11

 
Decline in fair value from 20%
    adverse change
$
23

 
$
21

 
Effective discount rate
7.61
%
 
7.52
%
 
Decline in fair value from 10%
    adverse change
$
17

 
$
16

 
Decline in fair value from 20%
    adverse change
$
33

 
$
31

 
Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions
Table 57: Residential Mortgage Loan Servicing Rights – Key Valuation Assumptions
Dollars in millions
September 30
2017

 
December 31
2016

 
Fair value
$
1,226

 
$
1,182

 
Weighted-average life
    (years)
6.4

 
6.8

 
Weighted-average constant
    prepayment rate
10.23
%
 
9.41
%
 
Decline in fair value from
    10% adverse change
$
49

 
$
45

 
Decline in fair value from
    20% adverse change
$
94

 
$
86

 
Weighted-average option
    adjusted spread
827

bps 
850

bps 
Decline in fair value from
    10% adverse change
$
37

 
$
37

 
Decline in fair value from
    20% adverse change
$
72

 
$
72