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Accounts Receivable
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable

(In millions)
2012
 
2011
Accounts receivable
$
2,662

 
$
2,946

Allowance for doubtful accounts
(99
)
 
(97
)
 
$
2,563

 
$
2,849