Condensed Consolidated Statements of Financial Position (Unaudited) (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accumulated depreciation	$ 4,305	$ 4,146
Preferred Stock, par value	$ 1	$ 1
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	$ 1
Common Stock, shares authorized	800,000,000	800,000,000
Common Stock, shares issued	223,775,721	239,209,812
Common Stock, shares outstanding	223,775,721	239,209,812