Timeshare Financing Receivables - Schedule of Change in Allowance For Financing Receivables Losses (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019		Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		$ 172		$ 141
Write-offs		(53)		(22)
Provision for financing receivables losses	[1]	60		50
Allowance for loan loss, ending balance		179		169
Securitized and Pledged
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		43		27
Securitizations		29		30
Provision for financing receivables losses	[1]	(12)		(10)
Allowance for loan loss, ending balance		60		47
Unsecuritized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		129	[2]	114
Write-offs		(53)		(22)
Securitizations		(29)		(30)
Provision for financing receivables losses	[1]	72		60
Allowance for loan loss, ending balance		$ 119	[2]	$ 122

[1] Includes incremental provision for financing receivables losses, net of activity related to the repurchase of defaulted and upgraded securitized timeshare financing receivables.

[2] 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.