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LEASES - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 renewal_option	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease term	20 years
Number of renewals (or more than) | renewal_option	1
U.S. and Canada Leased Hotels
Lessee, Lease, Description [Line Items]
Impairment loss		$ 116	$ 99
Legacy-Starwood Office Building
Lessee, Lease, Description [Line Items]
Impairment loss from building accounted for as a finance lease			$ 34
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	10 years

X

- Definition

Lessee, Operating And Finance Lease, Number of Renewals

+ References

No definition available.

+ Details

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X

- Definition

Lessee, Operating And Finance Lease, Renewal Term

+ References

No definition available.

+ Details

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- Definition

Lessee, Operating And Finance Lease, Term Of Contract

+ References

No definition available.

+ Details

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X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of impairment loss from right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918425-209957

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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