Timeshare Financing Receivables - Past Due Financing Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,048	$ 1,245
Financing receivable, past due and current	1,185	1,340
31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	20	21
91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	8	7
121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	109	67
Securitized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	783	743
Financing receivable, past due and current	805	758
Securitized | 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	11	9
Securitized | 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	5	3
Securitized | 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	6	3
Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	265	502
Financing receivable, past due and current	380	582
Unsecuritized | 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	9	12
Unsecuritized | 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	3	4
Unsecuritized | 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	$ 103	$ 64