Timeshare Financing Receivables - Schedule of Timeshare Financing Receivables (Details) - USD ($) $ in Millions		Sep. 30, 2019		Dec. 31, 2018		Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Timeshare financing receivables		$ 1,318		$ 1,292
Less: allowance for financing receivables losses		(179)		(172)		$ (169)	$ (141)
Timeshare financing receivables, net		1,139		1,120
Securitized and Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Timeshare financing receivables		795		660
Less: allowance for financing receivables losses		(60)		(43)		(47)	(27)
Timeshare financing receivables, net		735		617
Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Timeshare financing receivables	[1]	523		632
Less: allowance for financing receivables losses		(119)	[1]	(129)	[1]	$ (122)	$ (114)
Timeshare financing receivables, net	[1]	$ 404		$ 503

[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.