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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2015
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, 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

Foreign currency translation adjustments
(73
)
 
(3
)
 
(25
)
 
(5
)
 
—

 
(106
)
Balance at March 31, 2015
$
1,823

 
$
192

 
$
598

 
$
292

 
$
—

 
$
2,905