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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
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:
 
 
March 31, 2019
 
December 31, 2018
March 31,
(Dollars in millions)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
CDI
 
$
605

 
$
(471
)
 
$
134

 
$
605

 
$
(460
)
 
$
145

Other, primarily customer relationship intangibles
 
1,318

 
(726
)
 
592

 
1,329

 
(716
)
 
613

Total
 
$
1,923

 
$
(1,197
)
 
$
726

 
$
1,934

 
$
(1,176
)
 
$
758