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Goodwill and Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by Business Segment
Allocations of Goodwill by business segment during 2018, 2017 and 2016 follow:

Table 57: Goodwill by Business Segment (a)
In millions
Retail Banking

Corporate & Institutional Banking

Asset Management Group

Total

 
December 31, 2016
$
5,795

$
3,244

$
64

$
9,103

 
December 31, 2017 (b)
$
5,795

$
3,314

$
64

$
9,173

 
December 31, 2018 (b)
$
5,795

$
3,359

$
64

$
9,218

 
(a)
The BlackRock business segment did not have any allocated goodwill during 2018, 2017 and 2016.
(b)
Corporate & Institutional Banking's goodwill balances include the impacts of $45 million at December 31, 2018 and $70 million at December 31, 2017 resulting from business acquisitions.

Commercial Mortgage Servicing Rights
Table 58: Commercial Mortgage Servicing Rights
In millions
2018

 
2017

 
2016

 
January 1
$
668

 
$
576

 
$
526

 
Additions:
 
 
 
 
 
 
From loans sold with servicing retained
57

 
88

 
61

 
Purchases
93

 
69

 
36

 
Changes in fair value due to:
 
 
 
 
 
 
Time and payoffs (a)
(143
)
 
(111
)
 
(92
)
 
Other (b)
51

 
46

 
45

 
December 31
$
726

 
$
668

 
$
576

 
Related unpaid principal balance at December 31
$
180,496

 
$
162,182

 
$
143,139

 
Servicing advances at December 31
$
220

 
$
217

 
$
265

 
(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.
Mortgage Servicing Rights
Changes in the residential MSRs follow:
Table 59: Residential Mortgage Servicing Rights
In millions
2018

 
2017

 
2016

 
January 1
$
1,164

 
$
1,182

 
$
1,063

 
Additions:
 
 
 
 
 
 
From loans sold with servicing retained
44

 
55

 
62

 
Purchases
129

 
185

 
188

 
Changes in fair value due to:
 
 
 
 
 
 
Time and payoffs (a)
(170
)
 
(175
)
 
(168
)
 
Other (b)
90

 
(83
)
 
37

 
December 31
$
1,257

 
$
1,164

 
$
1,182

 
Unpaid principal balance of loans serviced for others at December 31
$
125,388

 
$
126,769

 
$
125,381

 
Servicing advances at December 31
$
156

 
$
201

 
$
302

 
(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 from market-driven changes in interest rates and changes in model assumptions.
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 60: Commercial Mortgage Servicing Rights –Key Valuation Assumptions
Dollars in millions
December 31
2018

 
December 31
2017

 
Fair value
$
726

 
$
668

 
Weighted-average life (years)
4.1

 
4.4

 
Weighted-average constant prepayment rate
5.65
%
 
8.51
%
 
Decline in fair value from 10% adverse change
$
10

 
$
12

 
Decline in fair value from 20% adverse change
$
19

 
$
23

 
Effective discount rate
8.39
%
 
7.81
%
 
Decline in fair value from 10% adverse change
$
19

 
$
18

 
Decline in fair value from 20% adverse change
$
39

 
$
36

 
Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions
Table 61: Residential Mortgage Servicing Rights – Key Valuation Assumptions
Dollars in millions
December 31
2018

 
December 31
2017

 
Fair value
$
1,257

 
$
1,164

 
Weighted-average life (years)
6.9

 
6.4

 
Weighted-average constant prepayment rate
8.69

%
10.04

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

 
$
44

 
Decline in fair value from 20% adverse change
$
79

 
$
85

 
Weighted-average option adjusted spread
806

bps 
830

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

 
$
35

 
Decline in fair value from 20% adverse change
$
73

 
$
67