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Accounts Receivables, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule Of Accounts Receivable Sales
Accounts receivable sales were as follows:

 
 
Year Ended December 31,
(in millions)
 
2018
 
2017
 
2016
Accounts receivable sales
 
$
119

 
$
94

 
$
259