SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Defined Contribution Plan and Deferred Compensation Plan (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Defined contribution plan, cost	$ 19	$ 12	$ 19
Deferred Compensation Plan \| Marriott International
Share-based Compensation Arrangement by Share-based Payment Award
Minimum required fixed rate of return	3.50%	3.50%

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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