Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 145	$ 145
Finite-Lived Intangible Assets, Accumulated Amortization	88	84
Impairment of Intangible Assets, Finite-lived	11	0
Intangible assets, net	$ 46	$ 61