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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
(Dollars in millions)
Consumer
 
Wholesale
 
Total
Balance, January 1, 2018

$4,262

 

$2,069

 

$6,331

Reallocation related to intersegment transfer of business banking clients
128

 
(128
)
 
—

Balance, December 31, 2018

$4,390

 

$1,941

 

$6,331

 
 
 
 
 
 
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 amount of other intangible assets 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
—

 
(18
)
 
(18
)
Servicing rights originated
336

 
16

 
352

Servicing rights purchased
89

 
—

 
89

Changes in fair value:
 
 
 
 

Due to changes in inputs and assumptions 2
90

 
—

 
90

Other changes in fair value 3
(239
)
 
—

 
(239
)
Servicing rights sold
(3
)
 
—

 
(3
)
Balance, December 31, 2018

$1,983

 

$79

 

$2,062

 
 
 
 
 
 
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

1 Does not include expense associated with community development investments. See Note 12, “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:
 
December 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

$95

 

($29
)
 

$66

 

$79

 

($14
)
 

$65

Other
6

 
(5
)
 
1

 
32

 
(28
)
 
4

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Residential MSRs
1,983

 
—

 
1,983

 
1,710

 
—

 
1,710

Other
12

 
—

 
12

 
12

 
—

 
12

Total other intangible assets

$2,096

 

($34
)
 

$2,062

 

$1,833

 

($42
)
 

$1,791

1 Excludes other intangible assets that are indefinite-lived, carried at fair value, or fully amortized.
Finite-lived Intangible Assets Amortization Expense [Table Text Block] The Company’s estimated future amortization of intangible assets at December 31, 2018 is presented in the following table:
(Dollars in millions)
 
2019

$10

2020
8

2021
7

2022
6

2023
5

Thereafter
31

Total 1

$67

1 Does not include indefinite-lived intangible assets of $12 million.
Schedule of fees from residential mortgage servicing rights [Table Text Block] Income earned by the Company on its residential MSRs is derived primarily from contractually specified mortgage servicing fees and late fees, net of curtailment costs, and is presented in the following table.
 
Year Ended December 31
(Dollars in millions)
2018
 
2017
 
2016
Income from residential MSRs 1

$437

 

$403

 

$366

1 Recognized in Mortgage related income in the Consolidated Statements of Income.
Schedule of Principal Amount Outstanding of Residential Loans Serviced [Table Text Block] The UPB of residential mortgage loans serviced for third parties is presented in the following table:
(Dollars in millions)
December 31, 2018
 
December 31, 2017
UPB of loans underlying residential MSRs

$140,801

 

$136,071
Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs A summary of the significant unobservable inputs used to estimate the fair value of the Company’s residential MSRs and the uncertainty of the fair values in response to 10% and 20% adverse changes in those inputs at the reporting date, are presented in the following table.
(Dollars in millions)
December 31, 2018
 
December 31, 2017
Fair value of residential MSRs

$1,983

 

$1,710

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

$96

 

$85

Decline in fair value from 20% adverse change
183

 
160

Option adjusted spread (annual)
2
%
 
4
%
Decline in fair value from 10% adverse change

$44

 

$47

Decline in fair value from 20% adverse change
86

 
90

Weighted-average life (in years)
5.5

 
5.4

Weighted-average coupon
4.0
%
 
3.9
%
Schedule of fees from commercial mortgage servicing rights [Table Text Block] The following table presents the Company’s income earned from servicing commercial mortgages.
 
Year Ended December 31
(Dollars in millions)
2018
 
2017
 
2016
Income from commercial mortgage servicing rights 1

$26

 

$22

 

$1

Income from subservicing third party commercial mortgages 1
13

 
14

 
1

1 Recognized in Commercial real estate related income in the Consolidated Statements of Income.
Schedule of Principal Amount Outstanding of Commercial Loans Serviced [Table Text Block] The UPB of commercial mortgage loans serviced for third parties is presented in the following table:
(Dollars in millions)
December 31, 2018
 
December 31, 2017
UPB of commercial mortgages subserviced for third parties

$28,140

 

$24,294

UPB of loans underlying commercial mortgage servicing rights
6,399

 
5,760

Total UPB of commercial mortgages serviced for third parties

$34,539

 

$30,054
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] A summary of the significant unobservable inputs used to estimate the fair value of the Company’s commercial mortgage servicing rights and the uncertainty of the fair values in response to 10% and 20% adverse changes in those inputs at the reporting date, are presented in the following table.
(Dollars in millions)
December 31, 2018
 
December 31, 2017
Fair value of commercial mortgage servicing rights

$77

 

$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)
5
%
 
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)
8.1

 
7.0

Float earnings rate (annual)
1.1
%
 
1.1
%