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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Long-Term Asset Allocation Ranges) (Details)
12 Months Ended
Dec. 31, 2011
Minimum [Member]
 
Domestic and global equities 36.00%
Fixed income and convertible securities 35.00%
Hedge Funds 9.00%
Maximum [Member]
 
Domestic and global equities 60.00%
Fixed income and convertible securities 60.00%
Hedge Funds 21.00%