Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Net Contract Assets and Liabilities

Net contract assets were as follows:

	March 31, 2019			December 31, 2018
Contract assets included in prepaid and other current assets	$	20		$	16
Contract liabilities included in accrued liabilities	(3		)	(3		)
Contract liabilities included in other non-current liabilities	(4		)	(5		)
Net contract asset	$	13		$	8