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Accounts Receivables, Net
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivables, Net
Accounts Receivable, Net

The Accounts receivable, net balance of $782 million and $1,114 million at December 31, 2018 and 2017, respectively, included allowance for doubtful accounts of $1 million and $2 million at December 31, 2018 and 2017, respectively.

The Company enters into supply chain financing programs from time to time to sell certain accounts receivable without recourse to third-party financial institutions. Sales of accounts receivable are reflected as a reduction of accounts receivable on the Consolidated Balance Sheets and the proceeds are included in cash flow from operating activities in the Consolidated Statements of Cash Flows.

Accounts receivable sales were as follows:

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

 
$
94

 
$
259