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 |