Types of Temporary Differences and Carry-Forwards that Significantly Effect Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Employee benefits	$ 348	$ 347
Net operating loss carry-forwards	205	257
Tax credits	111	182
Reserves	63	57
Frequent guest program	68	47
Self-insurance	21	24
Deferred income	21	20
Joint venture interests	(49)	(34)
Other, net	31	48
Deferred taxes	819	948
Less: valuation allowance	(163)	(145)
Net deferred taxes	$ 656	$ 803