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Document And Entity Information
 12 Months Ended
Dec. 31, 2011
Document And Entity Information [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2011
Document Fiscal Year Focus 2011
Document Fiscal Period Focus FY
Entity Registrant Name ELBIT SYSTEMS LTD
Entity Central Index Key 0001027664
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 42,607,788