Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue Recognized

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Revenue recognized over time	$	1,495	$	1,474	$	4,409	$	4,335
Revenue recognized at a point in time	1,672		1,610		4,204		4,539
Total revenue	$	3,167	$	3,084	$	8,613	$	8,874

Net Contract Assets and Liabilities

Net contract assets were as follows:

	September 30, 2020		December 31, 2019
Contract assets included in prepaid and other current assets	$	42	$	30
Contract liabilities included in accrued liabilities	(1)		(5)
Net contract asset	$	41	$	25