XML 82 R91.htm IDEA: XBRL DOCUMENT

Stock-Based Associate Compensation Plans(Assumptions Used In Option Grants Issued) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Weighted - average expected term		9 years
Weighted-average fair value of options granted during the period	$ 6.78	$ 7.29
Maximum [Member]
Weighted - average expected term	10 years
Expected volatility	26.20%	26.12%
Dividend yield	4.52%	5.29%
Risk-free rates	2.00%	3.41%
Minimum [Member]
Weighted - average expected term	8 years
Expected volatility	25.26%	26.06%
Dividend yield	4.51%	4.70%
Risk-free rates	1.58%	2.86%

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.

+ References+ Details