Supplemental Data (Summary of Inventories) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory
Raw materials	$ 394	$ 321
Work in process	189	206
Finished goods	1,202	1,147
Supplies and other	263	271
Gross inventories	2,048	1,945
Excess of FIFO or weighted-average cost over LIFO cost	(145)	(155)
Total	1,903	1,790
LIFO
Inventory
Raw materials	131	85
Work in process	103	113
Finished goods	453	451
Supplies and other	0	0
Gross inventories	687	649
Excess of FIFO or weighted-average cost over LIFO cost	(145)	(155)
Total	542	494
Non- LIFO
Inventory
Raw materials	263	236
Work in process	86	93
Finished goods	749	696
Supplies and other	263	271
Gross inventories	1,361	1,296
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,361	$ 1,296