XML 136 R129.htm IDEA: XBRL DOCUMENT

Share-Based Compensation Plans (Fair Value Of The Options Granted) (Details)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009 years
Share-Based Compensation Plans [Abstract]
Weighted-average volatility	26.46%	26.82%	27.32%
Weighted-average dividend yield	2.00%	2.00%	2.00%
Weighted-average expected term, years	6.73	6.74	6.63
Weighted-average risk-free rate	2.80%	3.04%	2.13%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References+ Details