Timeshare Financing Receivables - Allowance For Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance	$ 120	$ 106
Write-offs	(7)	(9)
Securitizations	0
Provision for loan loss	11	10
Allowance for loan loss, ending balance	124	107
Securitized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance	9	17
Write-offs	0	0
Securitizations	28
Provision for loan loss	0	(3)
Allowance for loan loss, ending balance	37	14
Unsecuritized
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan loss, beginning balance	111	89
Write-offs	(7)	(9)
Securitizations	(28)
Provision for loan loss	11	13
Allowance for loan loss, ending balance	$ 87	$ 93