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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative [Line Items]      
Derivative losses included in AOCI $ 3    
Currency Swap      
Derivative [Line Items]      
Derivative instruments outstanding $ 300   $ 300
Proceeds from current swap   $ (15)  
Interest receivable   $ 2