Consolidated Variable Interest Entities and Investments in Affiliates - Schedule of Assets and Liabilities Included in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Property and equipment, net	$ 8,464	$ 8,541
Cash and cash equivalents	357	337	$ 346	$ 72
Restricted cash	20	13
Accounts receivable, net	158	130
Prepaid expenses	48	58
Debt	3,015	3,012
Accounts payable and accrued expenses	178	167
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Property and equipment, net	209	208
Cash and cash equivalents	18	14
Restricted cash	14	13
Accounts receivable, net	4	2
Prepaid expenses	1	2
Debt	207	207
Accounts payable and accrued expenses	$ 9	6
Deferred income tax liabilities		$ 49