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Goodwill
 9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill

We perform an impairment test for goodwill and indefinite-lived intangible assets annually as of October 1, or more frequently if indicators of potential impairment exist. Due to the change in our reporting segments (See “Note 15 – Segment Information”), we now report Land Drilling Rigs as a segment. The goodwill associated with the Land Drilling Rigs reporting unit was previously impaired in 2014.
 
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