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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
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, 2019

$1,983

 

$79

 

$2,062

Amortization 1
—

 
(3
)
 
(3
)
Servicing rights originated
63

 
4

 
67

Changes in fair value:
 
 
 
 

Due to changes in inputs and assumptions 2
(110
)
 
—

 
(110
)
Other changes in fair value 3
(52
)
 
—

 
(52
)
Servicing rights sold
(1
)
 
—

 
(1
)
Balance, March 31, 2019

$1,883

 

$80

 

$1,963

 
 
 
 
 
 
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

1 Does not include expense associated with community development investments. See Note 11, “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.
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, 2019
 
December 31, 2018
(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

$99

 

($32
)
 

$67

 

$95

 

($29
)
 

$66

Other
6

 
(5
)
 
1

 
6

 
(5
)
 
1

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Residential MSRs
1,883

 
—

 
1,883

 
1,983

 
—

 
1,983

Other
12

 
—

 
12

 
12

 
—

 
12

Total other intangible assets

$2,000

 

($37
)
 

$1,963

 

$2,096

 

($34
)
 

$2,062

1 Excludes other intangible assets that are indefinite-lived, carried at fair value, or fully amortized.
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.
 
Three Months Ended March 31
(Dollars in millions)
2019
 
2018
Income from residential MSRs 1

$111

 

$107

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)
March 31, 2019
 
December 31, 2018
UPB of loans underlying residential MSRs

$138,793

 

$140,801
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)
March 31, 2019
 
December 31, 2018
Fair value of residential MSRs

$1,883

 

$1,983

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

$99

 

$96

Decline in fair value from 20% adverse change
188

 
183

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

$40

 

$44

Decline in fair value from 20% adverse change
78

 
86

Weighted-average life (in years)
5.2

 
5.5

Weighted-average coupon
4.0
%
 
4.0
%
Schedule of fees from commercial mortgage servicing rights [Table Text Block] The following table presents the Company’s income earned from servicing commercial mortgages.
 
Three Months Ended March 31
(Dollars in millions)
2019
 
2018
Income from commercial mortgage servicing rights 1

$6

 

$7

Income from subservicing third party commercial mortgages 1
3

 
3

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)
March 31, 2019
 
December 31, 2018
UPB of commercial mortgages subserviced for third parties

$29,195

 

$28,140

UPB of loans underlying commercial mortgage servicing rights
6,585

 
6,399

Total UPB of commercial mortgages serviced for third parties

$35,780

 

$34,539
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)
March 31, 2019
 
December 31, 2018
Fair value of commercial mortgage servicing rights

$78

 

$77

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
%
 
5
%
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)
8.2

 
8.1

Float earnings rate (annual)
1.1
%
 
1.1
%