Timeshare Financing Receivables - Past Due Financing Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,191	$ 1,204
Financing receivable, past due	1,280	1,292
Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	604	648
Financing receivable, past due	618	660
Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	587	556
Financing receivable, past due	662	632
31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	21	19
31 - 90 days past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	9	8
31 - 90 days past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	12	11
91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	7	6
91 - 120 days past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	3	3
91 - 120 days past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	4	3
121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	61	63
121 days and greater past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	2	1
121 days and greater past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	$ 59	$ 62