Employee Benefit Plans (Summary of Participants) (Details)	Dec. 31, 2010 employees
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Active Employees	4,879
Retirees And Beneficiaries	11,360
Other	6,340	[1]
Total	22,579
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Active Employees	2,827
Retirees And Beneficiaries	12,234
Other	62	[1]
Total	15,123

[1] For pension plans, the other category consists mostly of terminated but vested former employees. For post-retirement plans, the other category consists of employees on long-term disability that have not yet retired.