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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Asset Alllocations of the Pension Benefit Plans' Assets) (Details)
Dec. 31, 2011
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
   
Domestic equity securities 21.00% 22.00%
Debt securities 41.00% 34.00%
Global/International equity securities 24.00% 29.00%
Other 14.00% 15.00%
Asset Allocations, Total 100.00% 100.00%
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Domestic equity securities 0.00% 0.00%
Debt securities 0.00% 0.00%
Global/International equity securities 0.00% 0.00%
Other 0.00% 0.00%
Asset Allocations, Total 0.00% 0.00%