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Revenue (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]  
Net Contract Assets and Liabilities
Net contract assets were as follows:
 
March 31, 2018
 
January 1, 2017
Contract assets, included in prepaid and other current assets
$
20

 
$
26

Contract liabilities, included in accrued liabilities
(1
)
 
(1
)
Contract liabilities, included in other non-current liabilities
(7
)
 
(7
)
Net contract asset
$
12

 
$
18