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Financial Items - Summary of Financial Items (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Material income and expense [abstract]      
Financial income $ 20 $ 21 $ 18
Results from financial instruments, net (notes 13.2 and 16.4) (17) (1) 39
Foreign exchange results 6 (32) 10
Effects of amortized cost on assets and liabilities and others, net (122) (59) (59)
Other Income Expense Net 3   (10)
Other financial income (expense), net $ (110) $ (71) $ (2)