Timeshare Financing Receivables - Past Due Financing Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,232	$ 1,204
Financing receivable, past due	1,318	1,292
Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	783	648
Financing receivable, past due	795	660
Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	449	556
Financing receivable, past due	523	632
31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	18	19
31 - 90 days past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	7	8
31 - 90 days past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	11	11
91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	8	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	5	3
121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	60	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	$ 58	$ 62