Other Income, Net Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Interest income	$ 2	$ 2
Components of net periodic benefit cost other than service cost (Note 9)	2	(14)
Impairment of investment in PolyCharge	3	0
Other, net	1	0
Other income (expense), net	$ 2	$ (12)