Inventory (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Inventory [Line Items]
Completed unsold VOIs	$ 232		$ 233
Construction in process	17		20
Land, infrastructure and other	258		260
Inventory	507		513
Cost of VOI sales (less than for the $1 million)	33	$ 38
Increase (decrease) in inventories due to the true up of cost of sale (less than for the $1 million)	(6)	4
Promotional allowances	11	$ 10
Time Share
Inventory [Line Items]
Cost of VOI sales (less than for the $1 million)	1		10
Increase (decrease) in inventories due to the true up of cost of sale (less than for the $1 million)	$ 1		$ 10