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Other Expense, Net - Summary of Other Expense Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income And Expenses [Abstract]      
Environmental expense     $ 323
Reimbursement Agreement expense $ 146 $ 108 49
Other, net 1 10 (3)
Other expense net $ 147 $ 118 $ 369