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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 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:
 
 
June 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

 
$
(436
)
 
$
169

 
$
605

 
$
(409
)
 
$
196

Other, primarily customer relationship intangibles
 
1,165

 
(687
)
 
478

 
1,211

 
(696
)
 
515

Total
 
$
1,770

 
$
(1,123
)
 
$
647

 
$
1,816

 
$
(1,105
)
 
$
711