Revenues and Long-Lived Assets by Geographical Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 5,469	$ 5,524	$ 5,387
Property and equipment, net	9,671	9,760	9,692
United States
Segment Reporting Information [Line Items]
Revenues	5,381	5,417	5,260
Property and equipment, net	9,570	9,651	9,548
Australia
Segment Reporting Information [Line Items]
Revenues			19
Brazil
Segment Reporting Information [Line Items]
Revenues	23	19	22
Property and equipment, net	45	49	59
Canada
Segment Reporting Information [Line Items]
Revenues	65	67	59
Property and equipment, net	$ 56	60	71
Mexico
Segment Reporting Information [Line Items]
Revenues		$ 21	27
Property and equipment, net			$ 14