Supplemental Data (Summary of Inventories) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Raw materials	$ 494	$ 497
Work in process	329	371
Finished goods	1,442	1,468
Supplies and other	314	300
Gross inventories	2,579	2,636
Excess of FIFO or weighted-average cost over LIFO cost	(231)	(280)
Total	2,348	2,356
LIFO
Raw materials	148	163
Work in process	194	245
Finished goods	656	708
Supplies and other	0	0
Gross inventories	998	1,116
Excess of FIFO or weighted-average cost over LIFO cost	(231)	(280)
Total	767	836
Non-LIFO
Raw materials	346	334
Work in process	135	126
Finished goods	786	760
Supplies and other	314	300
Gross inventories	1,581	1,520
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,581	$ 1,520