Leases, Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Lessee Disclosure [Abstract]
Operating Lease, Payments	$ 14	$ 12
Finance Lease, Interest Payment on Liability	2	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	6
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 1	$ 0
Operating Lease, Weighted Average Remaining Lease Term	6 years	5 years
Finance Lease, Weighted Average Remaining Lease Term	5 years
Operating Lease, Weighted Average Discount Rate, Percent	4.00%	4.00%
Finance Lease, Weighted Average Discount Rate, Percent	3.00%