Inventories (Tables)

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories are comprised of the following (in millions).

	December 31,
	2020		2019
Raw materials	$	4,821	$	4,492
Work in process and other		2,541		2,700
Finished manufactured goods		4,412		4,821
Goods acquired for resale		7,434		7,839
	$	19,208	$	19,852