Intangible Assets - Schedule of Intangible Assets And Related Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 38	$ 48
Total gross intangible assets	2,103	2,103	$ 183
Less: accumulated amortization	(150)	(150)	(102)
Finite-Lived Intangible Assets, Net, Total	$ 1,953	1,953	81
Trade name
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ 20
Weighted-average useful life (years)		1 year
Management contracts
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ 1,352	89
Weighted-average useful life (years)		17 years 6 months
Club member relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ 146
Weighted-average useful life (years)		10 years
Vacation Ownership Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ 463
Weighted-average useful life (years)		5 years 6 months
Computer software
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ 122	$ 94
Weighted-average useful life (years)		2 years 3 months 18 days