Consolidated Variable Interest Entities ("VIEs") and Investments in Affiliates - Schedule of Assets and Liabilities Included in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Property and equipment, net	$ 9,125	$ 9,193
Cash and cash equivalents	868	951
Restricted cash	32	30
Accounts receivable, net	38	26
Prepaid expenses	35	39
Other assets	53	60
Debt	5,121	5,121
Accounts payable and accrued expenses	196	147
Other liabilities	134	134
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Property and equipment, net	214	216
Cash and cash equivalents	9	8
Restricted cash	2	2
Accounts receivable, net	2	1
Prepaid expenses	1	1
Other assets		1
Debt	207	207
Accounts payable and accrued expenses	6	5
Other liabilities	$ 2	$ 1