Employee Benefits (Weighted Average Assumptions- Accrued Postretirement Benefits - Other Postretirment Benefit Plans) (Details) (Accrued Postretirement Benefit, Other Postretirement Benefit Plans, Defined Benefit)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accrued Postretirement Benefit | Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.30%	5.50%
Initial	8.00%	8.50%
Ultimate	5.00%	5.00%
Year ultimate reached	2026	2018
Defined Benefit Plan, Effect of One Percentage Point Increase on Discount Rate	1.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation, Percentage	14.10%
Defined Benefit Plan, Effect of One Percentage Point Decrease on Discount Rate	1.00%
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation, Percentage	17.90%