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Share-Based Compensation And Other Compensation Arrangements (Schedule Of Assumptions Used For Fair Value Of Stock Options Granted) (Details) (USD $)	0 Months Ended	1 Months Ended
	Feb. 27, 2012	Feb. 28, 2011	Feb. 28, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected Life (in years)	6 years	6 years	6 years
Expected Volatility	29.90%	29.80%	31.50%
Expected Dividend Yield	2.40%	2.30%	3.00%
Risk Free Interest Rate	1.10%	2.50%	2.90%
Weighted-Average Grant Date Fair Value Per Share	$ 16.89	$ 17.96	$ 15.70

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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