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Benefit Plans And Obligations For Termination Indemnity (Weighted Average Assumptions) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.10% 4.40%
Expected long-term rate of return on Plans' assets 7.00% 7.30%
Rate of compensation increase 2.20% 2.40%
Retiree Medical Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.78% 3.78%
Health care cost trend rate assumed for next year 8.00% 8.50%
Ultimate health care cost trend rate 5.00% 5.00%