Consolidated Variable Interest Entities and Investments in Affiliates - Schedule of Assets and Liabilities Included in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Property and equipment, net	$ 8,516	$ 8,541
Cash and cash equivalents	318	337	$ 116	$ 72
Restricted cash	18	13
Accounts receivable, net	180	130
Prepaid expenses	51	58
Debt	3,012	3,012
Accounts payable and accrued expenses	174	167
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Property and equipment, net	210	208
Cash and cash equivalents	13	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