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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
(Dollars in millions)
Consumer
 
Wholesale
 
Total
Balance, January 1, 2017

$4,262

 

$2,075

 

$6,337

Measurement period adjustment related to the acquisition of Pillar
—

 
1

 
1

Sale of PAC
—

 
(7
)
 
(7
)
Balance, December 31, 2017

$4,262

 

$2,069

 

$6,331
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]
Changes in the carrying amounts of other intangible assets for the years ended December 31 are presented in the following table:
(Dollars in millions)
Residential MSRs - Fair Value
 
Commercial Mortgage Servicing Rights and Other
 
Total
Balance, January 1, 2017

$1,572

 

$85

 

$1,657

Amortization 1
—

 
(20
)
 
(20
)
Servicing rights originated
394

 
17

 
411

Changes in fair value:
 
 
 
 

Due to changes in inputs and assumptions 2
(22
)
 
—

 
(22
)
Other changes in fair value 3
(226
)
 
—

 
(226
)
Servicing rights sold
(8
)
 
—

 
(8
)
Other 4
—

 
(1
)
 
(1
)
Balance, December 31, 2017

$1,710

 

$81

 

$1,791

 
 
 
 
 
 
Balance, January 1, 2016

$1,307

 

$18

 

$1,325

Amortization 1
—

 
(9
)
 
(9
)
Servicing rights originated
312

 
—

 
312

Servicing rights purchased
200

 
—

 
200

Servicing rights acquired in Pillar acquisition
—

 
62

 
62

Other intangible assets acquired in Pillar acquisition 5
—

 
14

 
14

Changes in fair value:
 
 
 
 


Due to changes in inputs and assumptions 2
(13
)
 
—

 
(13
)
Other changes in fair value 3
(232
)
 
—

 
(232
)
Servicing rights sold
(2
)
 
—

 
(2
)
Balance, December 31, 2016

$1,572

 

$85

 

$1,657

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 the first quarter of 2017 measurement period adjustment on other intangible assets acquired previously in the Pillar acquisition.
5 The majority of other intangible assets acquired from Pillar relate to indefinite-lived agency licenses.
Schedule of intangible assets [Table Text Block]
The gross carrying amount and accumulated amortization of other intangible assets are presented in the following table:
 
December 31, 2017
 
December 31, 2016
(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

$79

 

($14
)
 

$65

 

$62

 

$—

 

$62

Other (definite-lived)
32

 
(28
)
 
4

 
35

 
(22
)
 
13

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Residential MSRs (carried at fair value)
1,710

 
—

 
1,710

 
1,572

 
—

 
1,572

Other (indefinite-lived)
12

 
—

 
12

 
10

 
—

 
10

Total other intangible assets

$1,833

 

($42
)
 

$1,791

 

$1,679

 

($22
)
 

$1,657

1 Excludes fully amortized other intangible assets.
Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs
(Dollars in millions)
December 31, 2017
 
December 31, 2016
Fair value of residential MSRs

$1,710

 

$1,572

Prepayment rate assumption (annual)
13
%
 
9
%
Decline in fair value from 10% adverse change

$85

 

$50

Decline in fair value from 20% adverse change
160

 
97

Option adjusted spread (annual)
4
%
 
8
%
Decline in fair value from 10% adverse change

$47

 

$63

Decline in fair value from 20% adverse change
90

 
122

Weighted-average life (in years)
5.4

 
7.0

Weighted-average coupon
3.9
%
 
4.0
%
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 are presented in the following table.
(Dollars in millions)
December 31, 2017
 
December 31, 2016
Fair value of commercial mortgage servicing rights

$75

 

$62

Discount rate (annual)
12
%
 
12
%
Prepayment rate assumption (annual)
7

 
6

Float earnings rate (annual)
1.1

 
0.5

Weighted-average life (in years)
7.0

 
7.0
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The Company's estimated future amortization of intangible assets at December 31, 2017 is presented in the following table:
(Dollars in millions)
 
2018

$13

2019
10

2020
9

2021
8

2022
6

Thereafter
23

Total 1

$69

1 Does not include indefinite-lived intangible assets of $12 million.