Vacation Ownership Contract Receivables (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Vacation Ownership Contract Receivables [Abstract]
Interest income on securitized receivables	$ 363	$ 340	$ 332
Originated vacation ownership contract receivables	1,510	1,390	1,230
Vacation ownership contract principal collections	$ 890	$ 866	$ 820
Contract Receivable Weighted Average Interest Rate	14.10%	13.90%	13.90%
Minimum days which Company ceases to accrue interest on VOI contract receivables	90 days
VOI contract receivable written off as credit loss	120 days