Dispositions - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Apr. 01, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sales of assets, net		$ 276	$ 181
Furniture, fixtures and equipment replacement fund		191	$ 196	$ 213
Westin New York Grand Central
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sales of assets, net		302
Furniture, fixtures and equipment replacement fund		20
Gain on sale of business		$ 3
Westin Mission Hills Golf Resort & Spa | Subsequent Event
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sales of assets, net	$ 27