Inventories - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
LIFO inventory amount	$ 3,300	$ 2,800
Inventory classified in Other assets	2,194	2,070
Inventory Not Expected to be Sold Within One Year
Inventory [Line Items]
Inventory classified in Other assets	1,900	1,800
Inventories Produced in Preparation for Product Launches
Inventory [Line Items]
Inventory classified in Other assets	$ 256	$ 279