RELATIONSHIP WITH MAJOR CUSTOMER - Additional Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) property	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) property	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Revenue, Major Customer [Line Items]
Revenues	$ 5,371	$ 5,284	$ 5,305	$ 5,012	$ 5,289	$ 5,051	$ 5,409	$ 5,009	$ 20,972	$ 20,758	$ 20,452
Host Partnerships
Revenue, Major Customer [Line Items]
Revenues										$ 123	114
Host Hotels & Resorts Inc
Revenue, Major Customer [Line Items]
Number of properties owned or leased | property	60				74				60	74
Revenues									$ 2,406	$ 2,542	$ 2,671