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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]
(Dollars in millions)
 MSRs -
Fair Value
 
Other
 
Total
Balance, January 1, 2016

$1,307

 

$18

 

$1,325

Amortization 1
—

 
(4
)
 
(4
)
Servicing rights originated
110

 
—

 
110

Servicing rights purchased
77

 
—

 
77

Changes in fair value:
 
 
 
 

Due to changes in inputs and assumptions 2
(333
)
 
—

 
(333
)
Other changes in fair value 3
(99
)
 
—

 
(99
)
Servicing rights sold
(1
)
 
—

 
(1
)
Balance, June 30, 2016

$1,061

 

$14

 

$1,075

 
 
 
 
 
 
Balance, January 1, 2015

$1,206

 

$13

 

$1,219

Amortization 1
—

 
(3
)
 
(3
)
Servicing rights originated
117

 
13

 
130

Servicing rights purchased
109

 
—

 
109

Changes in fair value:
 
 
 
 


Due to changes in inputs and assumptions 2
72

 
—

 
72

Other changes in fair value 3
(109
)
 
—

 
(109
)
Servicing rights sold
(2
)
 
—

 
(2
)
Balance, June 30, 2015

$1,393

 

$23

 

$1,416

1 Does not include expense associated with non-qualified community development investments. See Note 8, "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.
Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs
(Dollars in millions)
June 30,
2016
 
December 31, 2015
Fair value of MSRs

$1,061

 

$1,307

Prepayment rate assumption (annual)
14
%
 
10
%
Decline in fair value from 10% adverse change

$51

 

$49

Decline in fair value from 20% adverse change
97

 
94

Option adjusted spread (annual)
9
%
 
8
%
Decline in fair value from 10% adverse change

$43

 

$64

Decline in fair value from 20% adverse change
83

 
123

Weighted-average life (in years)
5.3

 
6.6

Weighted-average coupon
4.1
%
 
4.1
%