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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by reportable segment for the years ended December 31, 2017 and 2016, are presented in the following table.
(Dollars in millions)
Western Hemisphere
Eastern Hemisphere
Total
Balance at December 31, 2015
$
2,040

$
763

$
2,803

Foreign currency translation
25

(31
)
(6
)
Balance at December 31, 2016
$
2,065

$
732

$
2,797

Disposals
(162
)
—

(162
)
Foreign currency translation
55

37

92

Balance at December 31, 2017
$
1,958

$
769

$
2,727