Revenue from Contracts with Customers - Remaining Transaction Price (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Advanced deposits
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Remaining Transaction Price	$ 117
Recognition Period	18 months
Recognition Method	Upon customer stays
Club Activation Fees
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Remaining Transaction Price	$ 62
Recognition Period	7 years
Recognition Method	Straight-line basis over average inventory holding period
Club Bonus Points
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Remaining Transaction Price	$ 38
Recognition Period	24 months
Recognition Method	Upon redemption