Basis of Presentation (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Change in Contract with Customer, Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 209	$ 168	$ 1,200	$ 1,200
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 65,000		$ 65,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation			We expect to recognize approximately 40 percent and 65 percent of our September 30, 2019 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.