Revenues and Long-Lived Assets by Geographical Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 5,430	$ 5,350	$ 5,321
Property and equipment, net	10,145	10,583	10,494
United States
Segment Reporting Information [Line Items]
Revenues	5,259	5,129	5,044
Property and equipment, net	9,913	10,294	10,030
Australia
Segment Reporting Information [Line Items]
Revenues	34	34	39
Property and equipment, net	85	88	102
Brazil
Segment Reporting Information [Line Items]
Revenues	34	30	36
Property and equipment, net	63	53	82
Canada
Segment Reporting Information [Line Items]
Revenues	54	58	87
Property and equipment, net	71	66	82
Chile
Segment Reporting Information [Line Items]
Revenues	9	25	32
Property and equipment, net		44	44
Mexico
Segment Reporting Information [Line Items]
Revenues	29	29	29
Property and equipment, net	13	18	26
New Zealand
Segment Reporting Information [Line Items]
Revenues	$ 11	45	54
Property and equipment, net		$ 20	$ 128