Timeshare Financing Receivables - Schedule of Timeshare Financing Receivables (Details) - USD ($) $ in Millions		Sep. 30, 2020		Dec. 31, 2019		Sep. 30, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables		$ 1,229		$ 1,340
Less: allowance for financing receivables losses		(217)		(184)		$ (179)	$ (172)
Timeshare financing receivables, net		1,012		1,156
Securitized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables		879		758
Less: allowance for financing receivables losses		(70)		(54)		(60)	(43)
Timeshare financing receivables, net		809		704
Unsecuritized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables	[1]	350		582
Less: allowance for financing receivables losses		(147)	[1]	(130)	[1]	$ (119)	$ (129)
Timeshare financing receivables, net	[1]	$ 203		$ 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 securitization activities.