REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue recognized from opening balance	$ 190	$ 184	$ 1,040	$ 1,058

Contract with Customer, Liability, Revenue Recognized, Opening Balance

No definition available.

Name:	h_ContractWithCustomerLiabilityRevenueRecognizedOpeningBalance
Namespace Prefix:	h_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration