Employee Benefit Plans Rates (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Percentage Of Increase Threshold Using Citigroup Average Life Discount Rate Table,	0.25%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Percentage Of Increase Threshold Using AA Bond Rate			0.25%
Discount rate-projected benefit obligation	4.25%	5.50%	5.50%
Expected long-term rate of return on plan assets	6.00%	6.00%	6.00%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Percentage Of Increase Threshold Using Citigroup Average Life Discount Rate Table,	0.25%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Percentage Of Increase Threshold Using AA Bond Rate			0.25%
Discount rate-projected benefit obligation	4.25%	5.50%	5.50%
Expected long-term rate of return on plan assets	3.00%	3.00%	3.00%