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

 
$
769

 
$
2,727

Acquisitions

 
23

 
23

Dispositions
(8
)
 

 
(8
)
  Foreign currency translation adjustments
(21
)
 
19

 
(2
)
Balance at March 31, 2018
$
1,929

 
$
811

 
$
2,740