Other Liabilities - Summary of Other Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Deferred gains on asset sales	$ 1,255	$ 1,079
Starwood Preferred Guest point liability	762	721
Deferred revenue including VOI sales	45	52
Benefit plan liabilities	48	53
Deferred rent	30	30
Insurance reserves	46	44
Other	88	90
Other liabilities	$ 2,274	$ 2,069