Earnings Per Share, Share Repurchases and Dividends on Common Stock #2 (Unaudited) (Details) (USD $)	1 Months Ended			3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share, Basic and Diluted [Abstract]
Dilutive effect of of stock awards granted to employees under stock-based compensation plans				4,400,000	4,900,000	4,200,000	4,600,000
Anti-dilutive shares excluded from computation of earnings per share				0	1,300,000	0	2,700,000
Common stock dividends per share, declared (in dollars per share)	$ 0.61	$ 0.55	$ 0.50			$ 1.77	$ 1.60
Increase in quarterly common stock dividend (percent)	11.00%	10.00%