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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 were as follows:
(Dollars in millions)
North
America
 
MENA/
Asia Pacific
 
Europe/
SSA/
Russia
 
Latin
America
 
Land Drilling Rigs
 
Total
Balance at December 31, 2014
$
1,896

 
$
195

 
$
623

 
$
297

 
$
—

 
$
3,011

Acquisitions
2

 
—

 
—

 
—

 
—

 
2

Purchase price and other adjustments
—

 
1

 
—

 
—

 
—

 
1

Foreign currency translation adjustments
(118
)
 
(8
)
 
(33
)
 
(11
)
 
—

 
(170
)
Balance at September 30, 2015
$
1,780

 
$
188

 
$
590

 
$
286

 
$
—

 
$
2,844