Debt and Other Obligations (Components of Interest Expense and Amortization of Deferred Financing Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt and Other Obligations [Abstract]
Interest Expense, Debt, Excluding Amortization	$ 176	$ 169	$ 350	$ 336
Amortization of deferred financing costs and adjustments on long-term debt	6	5	11	10
Other, net of capitalized interest	(4)	(5)	(8)	(9)
Interest expense and amortization of deferred financing costs	$ 178	$ 169	$ 353	$ 337