Revenues and Long-Lived Assets by Geographical Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 5,524	$ 5,387	$ 5,430
Property and equipment, net	9,760	9,692	10,145
United States
Segment Reporting Information [Line Items]
Revenues	5,417	5,260	5,259
Property and equipment, net	9,651	9,548	9,913
Australia
Segment Reporting Information [Line Items]
Revenues		19	34
Property and equipment, net			85
Brazil
Segment Reporting Information [Line Items]
Revenues	19	22	34
Property and equipment, net	49	59	63
Canada
Segment Reporting Information [Line Items]
Revenues	67	59	54
Property and equipment, net	60	71	71
Chile
Segment Reporting Information [Line Items]
Revenues			9
Mexico
Segment Reporting Information [Line Items]
Revenues	$ 21	27	29
Property and equipment, net		$ 14	13
New Zealand
Segment Reporting Information [Line Items]
Revenues			$ 11