Summary of Investments in Affiliates (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Schedule Of Investments [Line Items]
Our Investment		$ 48	$ 327
Our Portion of Debt		150	472
Total Debt		455	1,496
Distributions received	[1]	$ 30	49
European Joint Venture
Schedule Of Investments [Line Items]
Our Investment	[2],[3]		271
Our Portion of Debt	[2],[3]		316
Total Debt	[2],[3]		1,029
Distributions received	[1],[2],[3]		$ 31
Assets	[2],[3]		Eleven hotels in Europe
European Joint Venture | Upper Limit
Schedule Of Investments [Line Items]
Investment ownership percentage	[2],[3]		33.40%
European Joint Venture | Lower Limit
Schedule Of Investments [Line Items]
Investment ownership percentage	[2],[3]		32.10%
Asia/Pacific Joint Venture
Schedule Of Investments [Line Items]
Investment ownership percentage		25.00%	25.00%
Our Investment		$ 14	$ 15
Assets		A 36% interest in seven hotels in India	A 36% interest in seven hotels in India
Maui JV
Schedule Of Investments [Line Items]
Investment ownership percentage		67.00%	67.00%
Our Investment		$ 70	$ 83
Our Portion of Debt		22	27
Total Debt		32	41
Distributions received	[1]	$ 17	$ 7
Assets		131-unit vacation ownership project in Maui, HI	131-unit vacation ownership project in Maui, HI
Hyatt Place Nashville Downtown
Schedule Of Investments [Line Items]
Investment ownership percentage		50.00%	50.00%
Our Investment		$ (13)	$ (13)
Our Portion of Debt		30	30
Total Debt		60	60
Distributions received	[1]	$ 3	$ 3
Assets		One hotel in Nashville, TN	One hotel in Nashville, TN
Harbor Beach JV
Schedule Of Investments [Line Items]
Investment ownership percentage		49.90%	49.90%
Our Investment		$ (30)	$ (28)
Our Portion of Debt		75	75
Total Debt		150	149
Distributions received	[1]	$ 8	$ 7
Assets		One hotel in Fort Lauderdale, FL	One hotel in Fort Lauderdale, FL
Philadelphia Marriott Downtown JV
Schedule Of Investments [Line Items]
Investment ownership percentage		11.00%	11.00%
Our Investment		$ (6)	$ (6)
Our Portion of Debt		23	24
Total Debt		213	217
Distributions received	[1]	$ 2	$ 1
Assets		One hotel in Philadelphia, PA	One hotel in Philadelphia, PA
Other investments
Schedule Of Investments [Line Items]
Our Investment		$ 13	$ 5

[1] Distributions received were funded by cash from operations unless otherwise noted.

[2] Distributions received from Euro JV in 2017 include $9 million of loan refinancing proceeds.

[3] Our interests in the Euro JV were sold in December 2018.