Schedule Of Rent Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent and minimum concession fees	$ 679	$ 639	$ 622
Contingent concession expense	195	193	173
Rent and contingent concession expense	874	832	795
Less: sublease rental income	(5)	(6)	(5)
Total	$ 869	$ 826	$ 790