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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Components of Accounts Receivable
The components of accounts receivable, net are as follows (in millions):
 
December 31,
 
2015 Restated
 
2014
Accounts receivable, gross
$
677

 
$
672

Accounts receivable reserves
(6
)
 
(1
)
Accounts receivable, net
$
671

 
$
671