Revenues and Long-Lived Assets by Geographical Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 1,339	$ 1,302
Property and equipment, net	10,551		$ 10,583
United States
Segment Reporting Information [Line Items]
Revenues	1,296	1,243
Property and equipment, net	10,243		10,294
Australia
Segment Reporting Information [Line Items]
Revenues	8	9
Property and equipment, net	91		88
Brazil
Segment Reporting Information [Line Items]
Revenues	7	7
Property and equipment, net	58		53
Canada
Segment Reporting Information [Line Items]
Revenues	10	14
Property and equipment, net	73		66
Chile
Segment Reporting Information [Line Items]
Revenues	5	7
Property and equipment, net	48		44
Mexico
Segment Reporting Information [Line Items]
Revenues	7	7
Property and equipment, net	18		18
New Zealand
Segment Reporting Information [Line Items]
Revenues	6	$ 15
Property and equipment, net	$ 20		$ 20