Long-Term and Other Debt - Loss on Debt Financing Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Repayment and cancellation of principal balance at premium	$ 0	$ 0	$ 0	$ 50
Unamortized debt (premium) discount and deferred financing costs, net	1	0	1	10
Loss on debt financing transactions	$ 1	$ 0	$ 1	$ 60