Supplemental Data (Summary of Inventories) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Inventory
Raw materials	$ 329	$ 397
Work in process	203	203
Finished goods	1,030	1,214
Supplies and other	280	278
Gross inventories	1,842	2,092
Excess of FIFO or weighted-average cost over LIFO cost	(163)	(183)
Total	1,679	1,909
LIFO
Inventory
Raw materials	93	100
Work in process	114	110
Finished goods	430	525
Supplies and other	0	0
Gross inventories	637	735
Excess of FIFO or weighted-average cost over LIFO cost	(163)	(183)
Total	474	552
Non- LIFO
Inventory
Raw materials	236	297
Work in process	89	93
Finished goods	600	689
Supplies and other	280	278
Gross inventories	1,205	1,357
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,205	$ 1,357