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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]      
Derivative losses included in AOCI   $ 2  
Currency Swap      
Derivative [Line Items]      
Derivative instruments outstanding   $ 300 $ 300
Proceeds from current swap $ (15)    
Interest receivable $ 2