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Notes Receivable (Tables)
12 Months Ended
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Schedule of Notes Receivable
The Company's notes receivable were as follows:
 
As of December 31,
 
2017
 
2016
 
(In millions)
Notes receivable
$
16

 
$
34

Less current maturities(a)
14

 
18

Total notes receivable — non-current
$
2

 
$
16


(a)
The current portion of notes receivable is recorded in prepayments and other current assets on the consolidated balance sheets.