Supplemental Balance Sheet Data - Inventory (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Raw materials	$ 344	$ 362
Work in process	212	214
Finished goods	1,219	1,153
Supplies and other	278	275
Inventory, Gross	2,053	2,004
Excess of FIFO or weighted-average cost over LIFO cost	(196)	(191)
Total	1,857	1,813
LIFO
Raw materials	96	99
Work in process	119	120
Finished goods	494	461
Supplies and other	0	0
Inventory, Gross	709	680
Excess of FIFO or weighted-average cost over LIFO cost	(196)	(191)
Total	513	489
Non-LIFO
Raw materials	248	263
Work in process	93	94
Finished goods	725	692
Supplies and other	278	275
Inventory, Gross	1,344	1,324
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,344	$ 1,324