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Inventories - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Inventory Disclosure [Abstract]          
Percent of Last-in, First-out (LIFO) inventory to total inventory values 71.00%   71.00%   74.00%
Estimate in excess of current acquisition costs over stated inventory values $ 999   $ 999   $ 1,038
Cost of sales increase/reduction, liquidations of LIFO inventories 12 $ 4 5 $ 4  
Land held for residential or commercial development $ 40   $ 40   $ 39