Fair Value of Financial Instruments - Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	$ 144	$ 117
Other noncurrent liabilities	(2,270)	(2,236)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	144	117
Total noncurrent financial assets	144	117
Senior Notes	(5,740)	(6,441)
Commercial paper / Credit Facility	(4,511)	(3,197)
Other long-term debt	(168)	(174)
Other noncurrent liabilities	(177)	(196)
Total noncurrent financial liabilities	(10,596)	(10,008)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	138	112
Total noncurrent financial assets	138	112
Senior Notes	(5,316)	(6,712)
Commercial paper / Credit Facility	(4,511)	(3,197)
Other long-term debt	(156)	(179)
Other noncurrent liabilities	(177)	(196)
Total noncurrent financial liabilities	$ (10,160)	$ (10,284)