Lessor, Lease Revenue Components (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Mall
Lessor, Lease, Description [Line Items]
Minimum rents		$ 134	$ 128
Overage rents		5	7
Rent concessions	[1]	(59)	0
Total overage rents and rent concessions		(54)	7
Lease revenue		80	135
Other
Lessor, Lease, Description [Line Items]
Minimum rents		3	4
Overage rents		1	1
Rent concessions	[1]	(1)	0
Total overage rents and rent concessions		0	1
Lease revenue		$ 3	$ 5

[1] Rent concessions were provided to tenants as a result of the COVID-19 Pandemic and the impact on mall and other operations.