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Financial Instruments - Summary of Carrying Amounts and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial assets    
Derivative instruments $ 3 $ 2
Other investments and non-current accounts receivable 272 234
Other investments and non-current accounts receivable 275 236
Financial liabilities    
Long-term debt 9,160 9,303
Other financial obligations 967 1,044
Derivative instruments 53 46
Total financial liabilities 10,180 10,393
At Fair Value [Member]    
Financial assets    
Derivative instruments 3 2
Other investments and non-current accounts receivable 272 234
Other investments and non-current accounts receivable 275 236
Financial liabilities    
Long-term debt 9,687 9,711
Other financial obligations 1,012 1,071
Derivative instruments 53 46
Total financial liabilities $ 10,752 $ 10,828