Intangible Assets (Changes In Carrying Amount Of Goodwill By Segment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2015	$ 1,563
Goodwill acquired	82
Foreign Exchange	(42)
Balance at December 31, 2016	1,603
Hotel Group [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	329
Goodwill acquired	48
Foreign Exchange	0
Balance at December 31, 2016	377
Destination Network [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	1,207
Goodwill acquired	34
Foreign Exchange	(42)
Balance at December 31, 2016	1,199
Vacation Ownership [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	27
Goodwill acquired	0
Foreign Exchange	0
Balance at December 31, 2016	$ 27