Employee Benefit Plans (Weighted Average Returns Expected) (Details)	12 Months Ended
	Dec. 31, 2011
U S Equity Securities [Member]
Expected long-term rate of return on plan assets	2.61%
Non U S Equity Securities [Member]
Expected long-term rate of return on plan assets	1.50%
Global Equity Securities [Member]
Expected long-term rate of return on plan assets	0.99%
Debt Securities [Member]
Expected long-term rate of return on plan assets	1.69%
Global Private Equity [Member]
Expected long-term rate of return on plan assets	0.37%
Hedge Funds [Member]
Expected long-term rate of return on plan assets	0.24%
Real Estate And Cash [Member]
Expected long-term rate of return on plan assets	0.30%
Other Global Securities [Member]
Expected long-term rate of return on plan assets	0.30%