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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by reportable segment for the two years ended December 31, 2015 and 2014, were as follows:
(Dollars in millions)
North
America
 
MENA/
Asia Pacific
 
Europe/
SSA/
Russia
 
Latin
America
 
Land
Drilling
Rigs
 
Total
Balance at December 31, 2013
$
1,981

 
$
196

 
$
753

 
$
304

 
$
56

 
$
3,290

Impairment
—

 
—

 
(26
)
 
—

 
(40
)
 
(66
)
Acquisitions
—

 
6

 
—

 
—

 
—

 
6

Purchase price and other adjustments
1

 
—

 
8

 
—

 
(14
)
 
(5
)
Foreign currency translation
(86
)
 
(7
)
 
(112
)
 
(7
)
 
(2
)
 
(214
)
Balance at December 31, 2014
$
1,896

 
$
195

 
$
623

 
$
297

 
$
—

 
$
3,011

 
 
 
 
 
 
 
 
 
 
 
 
Acquisitions
3

 
—

 
—

 
—

 
—

 
3

Purchase price and other adjustments
—

 
1

 
—

 
—

 
—

 
1

Foreign currency translation adjustments
(143
)
 
(6
)
 
(50
)
 
(13
)
 
—

 
(212
)
Balance at December 31, 2015
$
1,756

 
$
190

 
$
573

 
$
284

 
$
—

 
$
2,803