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Employee Benefit Plans (Other Pension Assumptions) (Details)
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase (average) 4.00% 4.00%
Assumed health care cost trend rate Initial trend 8.00% 8.00%
Assumed health care cost trend rate Ultimate trend 5.00% 5.00%
Assumed health care cost trend rate Year ultimate reached 2019 2019
Qualified Pension Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 3.80% 4.60%
Nonqualified Pension Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 3.45% 4.20%
Postretirement Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 3.60% 4.40%