Contract Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Contract Assets and Liabilities [Abstract]
Contract with Customer, Liability	$ 35	$ 33
Contract with Customer, Liability, Additions	3
Contract with Customer, Liability, Revenue Recognized	$ (1)
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment	35 years