Supplemental Balance Sheet Data - Inventory (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Raw materials	$ 385	$ 397
Work in process	211	203
Finished goods	1,204	1,214
Supplies and other	283	278
Inventory, Gross	2,083	2,092
Excess of FIFO or weighted-average cost over LIFO cost	(181)	(183)
Total	1,902	1,909
LIFO
Raw materials	99	100
Work in process	113	110
Finished goods	499	525
Supplies and other	0	0
Inventory, Gross	711	735
Excess of FIFO or weighted-average cost over LIFO cost	(181)	(183)
Total	530	552
Non-LIFO
Raw materials	286	297
Work in process	98	93
Finished goods	705	689
Supplies and other	283	278
Inventory, Gross	1,372	1,357
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,372	$ 1,357