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 |