Fair Value of Financial Instruments - Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	$ 141	$ 159
Credit Facility	(750)	(900)
Other noncurrent liabilities	(2,137)	(2,366)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	141	159
Total noncurrent financial assets	141	159
Senior Notes	(8,242)	(8,031)
Credit Facility	(750)	(900)
Other long-term debt	(131)	(126)
Other noncurrent liabilities	(411)	(426)
Total noncurrent financial liabilities	(9,534)	(9,483)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	127	142
Total noncurrent financial assets	127	142
Senior Notes	(8,845)	(8,941)
Credit Facility	(750)	(900)
Other long-term debt	(134)	(128)
Other noncurrent liabilities	(411)	(426)
Total noncurrent financial liabilities	$ (10,140)	$ (10,395)