Shareholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Oct. 05, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Shareholders' Equity [Abstract]
Authorized capital stock, common stock		500,000,000
Common stock, par value		$ 1
Authorized capital stock, preferred stock		50,000,000
Preferred stock, par value		$ 1
Common stock, issued		481,880,634	481,880,634
Common stock, outstanding		356,437,880	372,052,313
Preferred stock, outstanding		0
Stock repurchased, shares		20,000,000
Repurchased shares - average price		$ 69.00
Repurchase of shares authorized	10,000,000
Percentage of shares repurchase	3.00%
Dividends declared per share		$ 1.88	$ 1.68	$ 1.52