Leases - Property revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Percent of rent structure, variable rent			100.00%
Lease income - operating leases
Minimum lease payments	$ 112	$ 112	$ 333	$ 335
Variable lease payments	82	100	191	281
Amortization of favorable and unfavorable income lease contracts, net	1	1	4	5
Subtotal - lease income from operating leases	195	213	528	621
Earned income on direct financing leases	1	2	4	7
Total property revenues	$ 196	$ 215	$ 532	$ 628