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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Accounts Receivable
(In millions)
2017
 
2016
Accounts receivable
$
2,141

 
$
1,870

Allowance for doubtful accounts
(116
)
 
(101
)
 
$
2,025

 
$
1,769