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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]
Changes in the carrying amounts of other intangible assets for the three months ended March 31 are presented in the following table:
(Dollars in millions)
Residential MSRs - Fair Value
 
Commercial Mortgage Servicing Rights and Other
 
Total
Balance, January 1, 2018

$1,710

 

$81

 

$1,791

Amortization 1
—

 
(5
)
 
(5
)
Servicing rights originated
76

 
4

 
80

Servicing rights purchased
74

 
—

 
74

Changes in fair value:
 
 
 
 

Due to changes in inputs and assumptions 2
111

 
—

 
111

Other changes in fair value 3
(55
)
 
—

 
(55
)
Balance, March 31, 2018

$1,916

 

$80

 

$1,996

 
 
 
 
 
 
Balance, January 1, 2017

$1,572

 

$85

 

$1,657

Amortization 1
—

 
(5
)
 
(5
)
Servicing rights originated
96

 
5

 
101

Changes in fair value:
 
 
 
 


Due to changes in inputs and assumptions 2
27

 
—

 
27

Other changes in fair value 3
(50
)
 
—

 
(50
)
Other 4
—

 
(1
)
 
(1
)
Balance, March 31, 2017

$1,645

 

$84

 

$1,729

1 Does not include expense associated with non-qualified community development investments. See Note 10, "Certain Transfers of Financial Assets and Variable Interest Entities," for additional information.
2 Primarily reflects changes in option adjusted spreads and prepayment speed assumptions, due to changes in interest rates.
3 Represents changes due to the collection of expected cash flows, net of accretion due to the passage of time.
4 Represents measurement period adjustment on other intangible assets acquired previously in the Pillar acquisition.
Schedule of intangible assets [Table Text Block]
The gross carrying value and accumulated amortization of other intangible assets are presented in the following table:
 
March 31, 2018
 
December 31, 2017
(Dollars in millions)
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
Amortized other intangible assets 1:
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage servicing rights

$83

 

($19
)
 

$64

 

$79

 

($14
)
 

$65

Other (definite-lived)
17

 
(13
)
 
4

 
32

 
(28
)
 
4

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Residential MSRs (carried at fair value)
1,916

 
—

 
1,916

 
1,710

 
—

 
1,710

Other (indefinite-lived)
12

 
—

 
12

 
12

 
—

 
12

Total other intangible assets

$2,028

 

($32
)
 

$1,996

 

$1,833

 

($42
)
 

$1,791

1 Excludes fully amortized other intangible assets.
Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs
A summary of the key inputs used to estimate the fair value of the Company’s residential MSRs at March 31, 2018 and December 31, 2017, and the sensitivity of the fair values to immediate 10% and 20% adverse changes in those inputs, are presented in the following table.
(Dollars in millions)
March 31, 2018
 
December 31, 2017
Fair value of residential MSRs

$1,916

 

$1,710

Prepayment rate assumption (annual)
13
%
 
13
%
Decline in fair value from 10% adverse change

$89

 

$85

Decline in fair value from 20% adverse change
169

 
160

Option adjusted spread (annual)
4
%
 
4
%
Decline in fair value from 10% adverse change

$53

 

$47

Decline in fair value from 20% adverse change
101

 
90

Weighted-average life (in years)
5.6

 
5.4

Weighted-average coupon
4.0
%
 
3.9
%
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
A summary of the key inputs used to estimate the fair value of the Company’s commercial mortgage servicing rights at March 31, 2018 and December 31, 2017, and the sensitivity of the fair values to immediate 10% and 20% adverse changes in those inputs, are presented in the following table.
(Dollars in millions)
March 31, 2018
 
December 31, 2017
Fair value of commercial mortgage servicing rights

$76

 

$75

Discount rate (annual)
12
%
 
12
%
Decline in fair value from 10% adverse change

$3

 

$3

Decline in fair value from 20% adverse change
6

 
6

Prepayment rate assumption (annual)
6
%
 
7
%
Decline in fair value from 10% adverse change

$1

 

$1

Decline in fair value from 20% adverse change
2

 
2

Weighted-average life (in years)
7.2

 
7.0

Float earnings rate (annual)
1.1
%
 
1.1
%