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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
(Dollars in millions)
Consumer Banking and Private Wealth Management
 
Wholesale Banking
 
Total
Balance, January 1, 2014

$4,262

 

$2,107

 

$6,369

Acquisition of Lantana Oil and Gas Partners, Inc.
—

 
8

 
8

Sale of RidgeWorth
—

 
(40
)
 
(40
)
Balance, December 31, 2014

$4,262

 

$2,075

 

$6,337

Balance, January 1, 2013

$3,962

 

$2,407

 

$6,369

Intersegment transfers
300

 
(300
)
 
—

Balance, December 31, 2013

$4,262

 

$2,107

 

$6,369
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]
(Dollars in millions)
Core Deposit
Intangibles
 
 MSRs -
Fair Value
 
Other
 
Total
Balance, January 1, 2014

$4

 

$1,300

 

$30

 

$1,334

Amortization
(4
)
 
—

 
(8
)
 
(12
)
MSRs originated
—

 
178

 
—

 
178

MSRs purchased
—

 
130

 
—

 
130

Changes in fair value:
 
 
 
 
 
 
 
Due to changes in inputs and assumptions 1
—

 
(234
)
 
—

 
(234
)
Other changes in fair value 2
—

 
(167
)
 
—

 
(167
)
Sale of MSRs
—

 
(1
)
 
—

 
(1
)
Sale of RidgeWorth
—

 
—

 
(9
)
 
(9
)
Balance, December 31, 2014

$—

 

$1,206

 

$13

 

$1,219

 
 
 
 
 
 
 
 
Balance, January 1, 2013

$17

 

$899

 

$40

 

$956

Amortization
(13
)
 
—

 
(10
)
 
(23
)
MSRs originated
—

 
352

 
—

 
352

Changes in fair value:
 
 
 
 
 
 
 
Due to changes in inputs and assumptions 1
—

 
302

 
—

 
302

Other changes in fair value 2
—

 
(252
)
 
—

 
(252
)
Sale of MSRs
—

 
(1
)
 
—

 
(1
)
Balance, December 31, 2013

$4

 

$1,300

 

$30

 

$1,334

1 Primarily reflects changes in discount rates and prepayment speed assumptions, due to changes in interest rates.
2 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)
December 31, 2014
 
December 31, 2013
Fair value of retained MSRs

$1,206

 

$1,300

Prepayment rate assumption (annual)
11
%
 
8
%
Decline in fair value from 10% adverse change

$46

 

$38

Decline in fair value from 20% adverse change
88

 
74

Option adjusted spread/discount rate (annual) 1
10
%
 
12
%
Decline in fair value from 10% adverse change

$55

 

$66

Decline in fair value from 20% adverse change
105

 
126

Weighted-average life (in years)
6.4

 
7.7

Weighted-average coupon
4.2
%
 
4.4
%