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Accounts Receivable
12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
(In millions)
2013
 
2012
Accounts receivable
$
2,534

 
$
2,662

Allowance for doubtful accounts
(99
)
 
(99
)
 
$
2,435

 
$
2,563