Long-Term and Other Debt - Loss on Debt Financing Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Repayment and cancellation of principal balance at premium		$ 50
Unamortized debt (premium) discount and deferred financing costs, net		10
Loss on debt financing transactions	$ 0	$ 60	$ 0	$ 60