Leases - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) renewal_option	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) renewal_option	Sep. 30, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Lease agreements of annual fixed rent			$ 773
Initial term			15 years
Number of renewal options | renewal_option	4		4
Renewal term			5 years
Total contract revenues	$ 2,196	$ 2,140	$ 6,455	$ 6,153
Renewal term of operating lease contract	5 years		5 years
Minimum
Lessee, Lease, Description [Line Items]
Term of operating leases			1 year
Term of long-term real estate leasing arrangements			1 year
Maximum
Lessee, Lease, Description [Line Items]
Term of operating leases			72 years
Remaining lease term			3 years
Term of long-term real estate leasing arrangements			86 years
Occupancy
Lessee, Lease, Description [Line Items]
Total contract revenues	$ 409	395	$ 1,202	1,150
Food and Beverage
Lessee, Lease, Description [Line Items]
Total contract revenues	411	$ 408	1,216	$ 1,182
Lease revenue related to conventions	$ 9		$ 36