Fair Value Measurements - Estimated Fair Values of Assets Measured on Nonrecurring Basis (Detail) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Loss, Property and equipment			$ 90
Goodwill impairment loss		$ 607	607
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Property and equipment	[1]		24
Fair Value, Total			24
Impairment Loss, Property and equipment	[1]		90
Goodwill impairment loss	[2]		607
Impairment Loss, Total			$ 697

[1] Fair value of our property and equipment as of December 31, 2020 was measured using significant unobservable inputs (Level 3). We estimated fair value of the assets using discounted cash flow analyses, with an estimated stabilized growth rate of 3%, a discounted cash flow term between 1.7 to 10 years, terminal capitalization rate ranging from 7.25% to 7.75%, and discount rates ranging from 9.5% to 12.5%. The discount and terminal capitalization rates used for the fair value of the assets reflected the risk profile of the markets where these properties are located.

[2] Fair value of our consolidated and unconsolidated hotel reporting units was measured using significant unobservable inputs (Level 3), which included discounted cash flows, terminal capitalization rates, and discount rates.