Timeshare Financing Receivables - Schedule of Change in Allowance For Financing Receivables Losses (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2020		Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		$ 184		$ 172
Write-offs		(19)		(36)
Provision for financing receivables losses	[1]	45		38
Allowance for loan loss, ending balance		210		174
Securitized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		54		43
Provision for financing receivables losses	[1]	(12)		(8)
Securitization		36
Allowance for loan loss, ending balance		78		35
Unsecuritized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		130	[2]	129
Write-offs		(19)		(36)
Provision for financing receivables losses	[1]	57		46
Securitization		(36)
Allowance for loan loss, ending balance		$ 132	[2]	$ 139

[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 securitization activities.