Condensed Consolidated Statements of Financial Position (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Accumulated depreciation on property, plant, and equipment	$ 4,164	$ 3,933
Shareholders' equity
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	245,691,965	253,889,622
Common stock, shares outstanding	245,691,965	253,889,622