Geographic and Business Segment Information - Reconciliation of Revenues from Consolidated Hotels to Condensed Consolidated Amounts and Hotel Adjusted EBITDA to Net Income (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues		$ 686	$ 688	$ 733	$ 684	$ 670	$ 671	$ 725	$ 661	$ 2,791	$ 2,727	$ 2,688
Hotel Adjusted EBITDA										758	804	811
Casualty and impairment loss, net										(26)	(15)
Depreciation and amortization expense										(288)	(300)	(287)
Corporate general and administrative										(68)	(71)	(83)
Other expenses										(63)	(19)	(16)
Interest income										2	2	1
Interest expense										(124)	(181)	(186)
Equity in earnings from investments in affiliates										40	3	22
(Loss) gain on foreign currency transactions										(4)	3
Income tax benefit (expense)										2,346	(82)	(118)
Other items	[1]									(6)	(28)	135
Net income		$ 61	$ 105	$ 115	$ 2,350	$ 17	$ 37	$ 62	$ 23	2,631	139	299
Total consolidated hotel revenue [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues										2,727	2,704	2,668
Other [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues										$ 64	$ 23	$ 20

[1] For 2015, includes $143 million of gain on sale of assets, net.