Supplemental Balance Sheet Data - Inventory (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Raw materials	$ 340	$ 329
Work in process	197	203
Finished goods	1,072	1,030
Supplies and other	294	280
Inventory, Gross	1,903	1,842
Excess of FIFO or weighted-average cost over LIFO cost	(165)	(163)
Total	1,738	1,679
LIFO
Raw materials	89	93
Work in process	110	114
Finished goods	440	430
Supplies and other	0	0
Inventory, Gross	639	637
Excess of FIFO or weighted-average cost over LIFO cost	(165)	(163)
Total	474	474
Non-LIFO
Raw materials	251	236
Work in process	87	89
Finished goods	632	600
Supplies and other	294	280
Inventory, Gross	1,264	1,205
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,264	$ 1,205