Timeshare Financing Receivables - Schedule of Change in Allowance For Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance	$ 141	$ 120
Write-offs	(9)	(7)
Securitization		0
Provision for loan loss	12	11
Allowance for loan loss, ending balance	144	124
Securitized and Pledged
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance	27	9
Write-offs	0	0
Securitization		28
Provision for loan loss	(5)
Allowance for loan loss, ending balance	22	37
Unsecuritized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance	114	111
Write-offs	(9)	(7)
Securitization		(28)
Provision for loan loss	17	11
Allowance for loan loss, ending balance	$ 122	$ 87