Consolidated Variable Interest Entities - Schedule of Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets, variable interest entity	$ 647	$ 471
Liabilities, variable interest entity	640	455
Variable Interest Entity, Primary Beneficiary | Restricted cash
Variable Interest Entity [Line Items]
Assets, variable interest entity	23	18
Variable Interest Entity, Primary Beneficiary | Timeshare financing receivables, net
Variable Interest Entity [Line Items]
Assets, variable interest entity	617	445
Variable Interest Entity, Primary Beneficiary | Non-recourse debt
Variable Interest Entity [Line Items]
Liabilities, variable interest entity	$ 639	$ 454