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Accounts Receivable
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
(In millions)
2015
 
2014
Accounts receivable
$
2,138

 
$
2,215

Allowance for doubtful accounts
(105
)
 
(89
)
 
$
2,033

 
$
2,126