Property and Equipment - Depreciation Expense and Capitalized Interest(Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Capitalized Interest		$ 0	$ 3
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	[1]	$ 97	$ 75

[1] Included in depreciation and amortization and corporate expense