Contract Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Capitalized contract cost, amortization period	4 years
Capitalized Contract Cost, Net [Roll Forward]
Capitalized contract costs, beginning balance	$ 54	$ 17
Capitalized	57	44
Amortization	(20)	(7)
Capitalized contract costs, ending balance	$ 91	$ 54