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Goodwill (Tables)
9 Months Ended
Sep. 30, 2011
Goodwill Disclosure [Abstract] 
Schedule of changes in carrying amount of goodwill
The changes in the carrying amount of goodwill during the nine months ended September 30, 2011 are as follows (in millions):
 
 
Communications
Segment
 
Coal
Mining
Segment
 
Total
Balance at December 31, 2010
$
1,427


$

 
$
1,427

Effect of foreign currency rate change
1



 
1

Balance at September 30, 2011
$
1,428

 
$

 
$
1,428