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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of Accounts Receivable
(In millions)
2016
 
2015
Accounts receivable
$
1,870

 
$
2,138

Allowance for doubtful accounts
(101
)
 
(105
)
 
$
1,769

 
$
2,033