Revenue from Contracts with Customers - Schedule of Accounts Receivable and Contract Asset from Contracts with Customers (Details) - Accounts Receivables - USD ($) $ in Millions		Sep. 30, 2018	Jan. 01, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Receivables	[1]	$ 135	$ 97
Contract asset		$ 5	$ 0

[1] Does not include financing receivables from sales of VOI. See Note 5: Timeshare Financing Receivables for additional information.