Timeshare Financing Receivables - Schedule of Change in Allowance For Financing Receivables Losses (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		$ 184		$ 172		$ 141
Write-offs		(48)		(62)		(38)
Provision for financing receivables losses	[1]	75		74		69
Allowance for loan loss, ending balance		211		184		172
Securitized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		54		43		27
Securitizations		30		27		28
Provision for financing receivables losses	[1]	(21)		(16)		(12)
Allowance for loan loss, ending balance		63		54		43
Unsecuritized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance		130	[2]	129		114
Write-offs		(48)		(62)		(38)
Securitizations		(30)		(27)		(28)
Provision for financing receivables losses	[1]	96		90		81
Allowance for loan loss, ending balance		$ 148	[2]	$ 130	[2]	$ 129

[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.