Revenues and Long-Lived Assets by Geographical Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 399	$ 1,052
Property and equipment, net	9,506		$ 9,416
United States
Segment Reporting Information [Line Items]
Revenues	397	1,038
Property and equipment, net	9,425		9,331
Brazil
Segment Reporting Information [Line Items]
Revenues	1	4
Property and equipment, net	31		34
Canada
Segment Reporting Information [Line Items]
Revenues	1	$ 10
Property and equipment, net	$ 50		$ 51