Timeshare Financing Receivables - Past Due Financing Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,009	$ 1,048
Financing receivable, past due and current	1,130	1,185
31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	13	20
91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	4	8
121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	104	109
Securitized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	671	783
Financing receivable, past due and current	684	805
Securitized | 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	7	11
Securitized | 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	2	5
Securitized | 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	4	6
Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	338	265
Financing receivable, past due and current	446	380
Unsecuritized | 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	6	9
Unsecuritized | 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	2	3
Unsecuritized | 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	$ 100	$ 103