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Fair Value of Financial Instruments - Financial Assets and Liabilities Not Carried at Fair Value (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Financial liabilities:    
Short-term and long-term debt (a) $ 4,663 $ 5,323
Carrying Amount    
Financial liabilities:    
Short-term and long-term debt (a) $ 3,996 $ 4,806