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Benefit Plans And Obligations For Termination Indemnity (Weighted Average Assumptions) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.40% 5.40%
Expected long-term rate of return on Plans' assets 7.30% 7.30%
Rate of compensation increase 2.40% 2.70%
Retiree Medical Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.78% 5.32%
Health care cost trend rate assumed for next year 8.50% 8.00%
Ultimate health care cost trend rate 5.00% 5.00%