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Fair Value of Financial Instruments - Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior, mezzanine, and other loans $ 162 $ 159
Other noncurrent liabilities (2,344) (2,366)
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior, mezzanine, and other loans 162 159
Total noncurrent financial assets 162 159
Senior Notes (8,716) (8,031)
Commercial paper / Credit Facility (400) (900)
Other long-term debt (126) (126)
Other noncurrent liabilities (426) (426)
Total noncurrent financial liabilities (9,668) (9,483)
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior, mezzanine, and other loans 146 142
Total noncurrent financial assets 146 142
Senior Notes (9,404) (8,941)
Commercial paper / Credit Facility (400) (900)
Other long-term debt (128) (128)
Other noncurrent liabilities (426) (426)
Total noncurrent financial liabilities $ (10,358) $ (10,395)