Revenue from Contracts with Customers - Remaining Transaction Price (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 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	$ 65
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	$ 48
Recognition Period	24 months
Recognition Method	Upon redemption