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Earnings Per Share, Share Repurchases and Dividends on Common Stock #2 (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended			3 Months Ended		9 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Dilutive effect of of stock awards and options granted to employees under stock-based compensation plans				3.0	4.4	3.2	4.2
Anti-dilutive stock options excluded from computation of earnings per share				0	0	0	0
Common stock dividends per share, declared (in dollars per share)	$ 0.70	$ 0.61	$ 0.55			$ 2.01	$ 1.77
Increase in quarterly common stock dividend (percent)	15.00%	11.00%

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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