Basis of Presentation (Unaudited) Backlog and Contract Assets and Liabilities (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Change in Contract with Customer, Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 781	$ 674
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 64,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation	We expect to recognize approximately 45 percent and 70 percent of our March 31, 2020 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.