Timeshare Financing Receivables - Schedule of Timeshare Financing Receivables (Details) - USD ($) $ in Millions		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables		$ 1,185		$ 1,340
Less: allowance for financing receivables losses		(211)		(184)		$ (172)	$ (141)
Timeshare financing receivables, net		974		1,156
Securitized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables		805		758
Less: allowance for financing receivables losses		(63)		(54)		(43)	(27)
Timeshare financing receivables, net		742		704
Unsecuritized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables	[1]	380		582
Less: allowance for financing receivables losses		(148)	[1]	(130)	[1]	$ (129)	$ (114)
Timeshare financing receivables, net	[1]	$ 232		$ 452

[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 upcoming securitization activities.