Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Accumulated depreciation	$ 19,362	$ 18,628
Common stock, par value	$ 0.30	$ 0.30
Common stock, shares authorized	1,800,000	1,800,000
Common stock, shares issued	1,010,894	1,004,351
Common stock held in treasury, shares	87,041	87,041