Timeshare Financing Receivables - Past Due Financing Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,143	$ 1,147
Financing receivable, past due	1,218	1,212
Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	419	462
Financing receivable, past due	429	471
Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	724	685
Financing receivable, past due	789	741
31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	18	16
31 - 90 days past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	6	6
31 - 90 days past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	12	10
91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	6	5
91 - 120 days past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	2	1
91 - 120 days past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	4	4
121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	51	44
121 days and greater past due | Securitized and Pledged
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	2	2
121 days and greater past due | Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	$ 49	$ 42