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Earnings Per Share, Share Repurchases and Dividends on Common Stock (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended				12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]
Antidilutive stock options					0	0	1.8
Dilutive effect of stock options and other stock awards granted					3.3	4.3	4.8
Increase (Decrease) in Stock Dividend, Percentage	15.00%	11.00%	10.00%
Common stock dividend (in dollars per share)	$ 0.70	$ 0.61	$ 0.55	$ 0.50	$ 2.71	$ 2.38	$ 2.15

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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