Revenues and Long-Lived Assets by Geographical Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 5,387	$ 5,354	$ 5,166
Property and equipment, net	10,661	10,575	10,995
United States
Segment Reporting Information [Line Items]
Revenues	5,166	5,077	4,895
Property and equipment, net	10,372	10,111	10,498
Australia
Segment Reporting Information [Line Items]
Revenues	34	39	40
Property and equipment, net	88	102	106
Brazil
Segment Reporting Information [Line Items]
Revenues	30	36	30
Property and equipment, net	53	82	76
Canada
Segment Reporting Information [Line Items]
Revenues	58	87	97
Property and equipment, net	66	82	89
Chile
Segment Reporting Information [Line Items]
Revenues	25	32	34
Property and equipment, net	44	44	54
Mexico
Segment Reporting Information [Line Items]
Revenues	29	29	24
Property and equipment, net	18	26	32
New Zealand
Segment Reporting Information [Line Items]
Revenues	45	54	46
Property and equipment, net	$ 20	$ 128	$ 140