Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 30	$ 26
Operating lease liabilities	91
Deferred revenue	9	7
Accrued expenses	34	28
Investment and foreign tax credits	1	4
Total gross deferred tax assets	165	65
Less: valuation allowance	0	(1)
Net deferred tax assets	165	64
Deferred tax liabilities:
Intangible assets	(99)	(93)
Investment basis difference	(19)	(19)
Operating lease assets, net	(90)
Property and equipment	(633)	(624)
Unrealized loss (gains) on derivative instruments, net	4	(2)
Equity component of convertible senior notes	(5)	(6)
Prepaid expenses	(2)	(1)
Total deferred tax liabilities	(844)	(745)
Net deferred tax liabilities	$ (679)	$ (681)