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Inventories - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Inventory Disclosure [Abstract]          
Percent of Last-in, First-out (LIFO) inventory to total inventory values 44.00%   44.00%   59.00%
Estimate in excess of current acquisition costs over stated inventory values $ 1,012   $ 1,012   $ 848
Cost of sales increase (reduction), liquidations of LIFO inventories $ 5 $ 11 $ 12 $ 5