Intangible Assets Intangible Assets (Changes In Carrying Amount Of Goodwill By Segment) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Goodwill [Roll Forward]
Balance at December 31, 2015		$ 1,563
Goodwill Acquired		10
Foreign Exchange		(24)
Balance at September 30, 2016	$ 1,549	1,549
Hotel Group [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015		329
Goodwill Acquired		0
Foreign Exchange		0
Balance at September 30, 2016	329	329
Destination Network [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015		1,207
Goodwill Acquired	10	10
Foreign Exchange		(24)
Balance at September 30, 2016	1,193	1,193
Vacation Ownership [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015		27
Goodwill Acquired		0
Foreign Exchange		0
Balance at September 30, 2016	$ 27	$ 27