Annual report pursuant to Section 13 and 15(d)

Retirement And Savings Benefit Plans (Target Allocation Of Investments By Asset Class) (Details)

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Retirement And Savings Benefit Plans (Target Allocation Of Investments By Asset Class) (Details)
12 Months Ended
Dec. 31, 2011
Retirement And Savings Benefit Plans [Abstract]  
Equity securities, minimum 46.00%
Equity securities, maximum 60.00%
Fixed income securities, minimum 25.00%
Fixed income securities, maximum 35.00%
Real estate securities, minimum 8.00%
Real estate securities, maximum 12.00%
Commodities and other, minimum 0.00%
Commodities and other, maximum 10.00%
Liquidity/cash equivalents, minimum 0.00%
Liquidity/cash equivalents, maximum 7.00%