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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Revenue Recognition [Line Items]    
Allowance for credit losses $ 117 $ 135
United States [Member]    
Revenue Recognition [Line Items]    
Percentage sales reserves and allowances to U.S. customers 80.00%