Geographic and Business Segment Information - Revenues and Property and Equipment, Net for Each of Geographical Areas (Detail) - USD ($) $ in Millions		3 Months Ended									12 Months Ended
		Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues		$ 810		$ 672	$ 703	$ 659	$ 686	$ 652	$ 731	$ 668	$ 2,844		$ 2,737	$ 2,791
Property and Equipment, net		9,594	[1]				7,975				9,594	[1]	7,975	8,311
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	[2],[3]										2,804		2,676	2,618
Property and Equipment, net	[2],[3]	$ 9,594					7,906				9,594		7,906	8,089
All Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues											$ 40		61	173
Property and Equipment, net							$ 69						$ 69	$ 222

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

[2] Excludes $62 million and $31 million of property and equipment, net classified as held for sale as of December 31, 2019 and 2017, respectively.

[3] Includes revenues of $11 million, $14 million and $13 million for the years ended December 31, 2019, 2018 and 2017 from our laundry operations which is not part of our segment. Also includes property and equipment, net of $5 million as of December 31, 2019, 2018 and 2017, respectively, from our laundry operations.