Geographic and Business Segment Information - Revenues and Property and Equipment, Net for Each of Geographical Areas (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues		$ 852	$ 2,844		$ 2,737
Property and Equipment, net		9,193	9,594	[1],[2]	7,975
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	[3]	849	2,804		2,676
Property and Equipment, net	[3]	9,193	9,594	[2]	7,906
All Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues		$ 3	$ 40		61
Property and Equipment, net					$ 69

[1] Excludes $62 million of property and equipment, net classified as held for sale as of December 31, 2019.

[2] Excludes $62 million of property and equipment, net classified as held for sale as of December 31, 2019.

[3] Includes revenues of $2 million, $11 million and $14 million for the years ended December 31, 2020, 2019 and 2018 from our laundry operations, which is not part of our segment and was permanently closed as of December 31, 2020. Also includes property and equipment, net of $2 million, $5 million and $5 million as of December 31, 2020, 2019 and 2018, respectively, from our laundry operations.