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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Identifiable Intangible Assets Subject to Amortization
The following table, which excludes fully amortized intangibles, presents information for identifiable intangible assets:
 
 
September 30, 2018
 
December 31, 2017
(Dollars in millions)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
CDI
 
$
605

 
$
(448
)
 
$
157

 
$
605

 
$
(409
)
 
$
196

Other, primarily customer relationship intangibles
 
1,340

 
(708
)
 
632

 
1,211

 
(696
)
 
515

Total
 
$
1,945

 
$
(1,156
)
 
$
789

 
$
1,816

 
$
(1,105
)
 
$
711