Basis of Presentation (Unaudited) Backlog and Contract Assets and Liabilities (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Change in Contract with Customer, Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 442	$ 333	$ 1,200	$ 1,000
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 70,000		$ 70,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation			We expect to recognize approximately 40 percent and 65 percent of our June 30, 2020 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.