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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by reportable segment for the nine months ended September 30, 2018, were as follows:
(Dollars in millions)
Western Hemisphere
 
Eastern Hemisphere
 
Total
Balance at December 31, 2017
$
1,958

 
$
769

 
$
2,727

Acquisitions
—

 
27

 
27

Dispositions
(8
)
 
—

 
(8
)
  Reclassification to assets held for sale
(44
)
 
(16
)
 
(60
)
  Foreign currency translation adjustments
(35
)
 
(19
)
 
(54
)
Balance at September 30, 2018
$
1,871

 
$
761

 
$
2,632