Leases - Property revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Percent of rent structure, variable rent			100.00%
Lease income - operating leases
Minimum lease payments	$ 109	$ 112	$ 221	$ 223
Variable lease payments	46	97	109	181
Amortization of favorable and unfavorable income lease contracts, net	1	2	3	4
Subtotal - lease income from operating leases	156	211	333	408
Earned income on direct financing leases	2	3	3	5
Total property revenues	$ 158	$ 214	$ 336	$ 413