Timeshare Financing Receivables - Schedule of Timeshare Financing Receivables (Details) - USD ($) $ in Millions		Jun. 30, 2021		Dec. 31, 2020		Jun. 30, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables		$ 1,130		$ 1,185
Less: allowance for financing receivables losses		(203)		(211)		$ (210)	$ (184)
Timeshare financing receivables, net		927		974
Securitized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables		684		805
Less: allowance for financing receivables losses		(47)		(63)		(78)	(54)
Timeshare financing receivables, net		637		742
Unsecuritized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables	[1]	446		380
Less: allowance for financing receivables losses		(156)	[1]	(148)	[1]	$ (132)	$ (130)
Timeshare financing receivables, net	[1]	$ 290		$ 232

[1] Includes amounts used as collateral to secure a non-recourse revolving timeshare receivable credit facility ("Timeshare Facility") as well as amounts held as future collateral for securitization activities.