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Financial Instruments - Summary of Fair Value of Derivative Financial Instruments at Fair Value Hierarchy (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments $ 3 $ 2
Investments in strategic equity securities 3 3
Other investments at fair value through earnings 23 34
Total derivative financial assets 29 39
Liabilities measured at fair value Derivative instruments 53 46
Level 1 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Investments in strategic equity securities 3 3
Total derivative financial assets 3 3
Level 2 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 3 2
Other investments at fair value through earnings 23 34
Total derivative financial assets 26 36
Liabilities measured at fair value Derivative instruments $ 53 $ 46