Timeshare Financing Receivables - Maturities of 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]
2019 (remaining)	$ 44
2020	139
2021	144
2022	147
2023	151
Thereafter	693
Timeshare financing receivable maturities, gross	1,318
Less: allowance for financing receivables losses	(179)		$ (172)		$ (169)	$ (141)
Timeshare financing receivable maturities, net	1,139
Securitized and Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
2019 (remaining)	22
2020	90
2021	94
2022	98
2023	101
Thereafter	390
Timeshare financing receivable maturities, gross	795
Less: allowance for financing receivables losses	(60)		(43)		(47)	(27)
Timeshare financing receivable maturities, net	735
Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
2019 (remaining)	22
2020	49
2021	50
2022	49
2023	50
Thereafter	303
Timeshare financing receivable maturities, gross	523
Less: allowance for financing receivables losses	(119)	[1]	$ (129)	[1]	$ (122)	$ (114)
Timeshare financing receivable maturities, net	$ 404

[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.