Supplemental Balance Sheet Data - Inventory (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Raw materials	$ 314	$ 362
Work in process	221	214
Finished goods	1,149	1,153
Supplies and other	263	275
Inventory, Gross	1,947	2,004
Excess of FIFO or weighted-average cost over LIFO cost	(168)	(191)
Total	1,779	1,813
LIFO
Raw materials	81	99
Work in process	130	120
Finished goods	462	461
Supplies and other	0	0
Inventory, Gross	673	680
Excess of FIFO or weighted-average cost over LIFO cost	(168)	(191)
Total	505	489
Non-LIFO
Raw materials	233	263
Work in process	91	94
Finished goods	687	692
Supplies and other	263	275
Inventory, Gross	1,274	1,324
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,274	$ 1,324