Condensed Consolidated Statements Of Financial Position (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Property, plant and equipment, accumulated depreciation	$ 14,554	$ 13,993
Other assets, accumulated amortization	$ 471	$ 717
Common stock, par value	$ 5.00	$ 5.00
Common stock, authorized	1,200,000,000	1,200,000,000
Common stock, shares issued	1,012,261,159	1,012,261,159
Treasury stock, shares	258,532,626	267,556,388