Supplemental Data (Summary of Inventories) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventory
Raw materials	$ 321	$ 362
Work in process	206	214
Finished goods	1,147	1,153
Supplies and other	271	275
Gross inventories	1,945	2,004
Excess of FIFO or weighted-average cost over LIFO cost	(155)	(191)
Total	1,790	1,813
LIFO
Inventory
Raw materials	85	99
Work in process	113	120
Finished goods	451	461
Supplies and other	0	0
Gross inventories	649	680
Excess of FIFO or weighted-average cost over LIFO cost	(155)	(191)
Total	494	489
Non- LIFO
Inventory
Raw materials	236	263
Work in process	93	94
Finished goods	696	692
Supplies and other	271	275
Gross inventories	1,296	1,324
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,296	$ 1,324