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ACQUISITIONS AND DISPOSITIONS - Acquisitions Narrative (Details) £ in Millions, $ in Millions				3 Months Ended	4 Months Ended	8 Months Ended	9 Months Ended			12 Months Ended
	Jun. 02, 2023 USD ($)	Jun. 02, 2023 GBP (£)	Feb. 02, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 GBP (£)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Cash paid							$ 28	$ 175
Fair value of contingent consideration							95			$ 115
Mr & Mrs Smith
Business Acquisition [Line Items]
Business acquisition, remaining interest percent acquired in acquisition				100.00%	100.00%	100.00%		100.00%
Net assets acquired \| £									£ 53
Purchase price	$ 72	£ 58
Business combination, pro forma information, revenue of acquiree since acquisition date, actual				$ 7	$ 9
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual				3	$ 3
Acquisition related costs				$ 0				$ 4
Cash paid	$ 50
Dream Hotel Group
Business Acquisition [Line Items]
Business acquisition, remaining interest percent acquired in acquisition				100.00%	100.00%	100.00%		100.00%
Purchase price			$ 232
Business combination, pro forma information, revenue of acquiree since acquisition date, actual						$ 5
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual						3
Acquisition related costs				$ 0				$ 7
Cash paid			125					125
Additional consideration				$ 175	$ 175	$ 175	174	$ 175
Fair value of contingent consideration			$ 107
Decrease in intangibles										21
Increase in goodwill										$ 21
Me and All Hotels
Business Acquisition [Line Items]
Consideration transferred							$ 28