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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
(In millions)
2018
 
2017
Accounts receivable
$
2,143

 
$
2,141

Allowance for doubtful accounts
(113
)
 
(116
)
 
$
2,030

 
$
2,025