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Taxes On Income (Narrative) (Details) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) Y | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2011 Israeli Tax Authority [Member] ILS | Dec. 31, 2011 Israeli Taxation [Member] | Dec. 31, 2010 Israeli Taxation [Member] | Dec. 31, 2011 Encouragement Of Industry (Taxes) 1996 [Member] Y | Dec. 31, 2011 U.S. Federal [Member] USD ($) Y | Dec. 31, 2011 U.S. State [Member] USD ($) | Dec. 31, 2011 Research And Development Tax Credits [Member] USD ($) | Dec. 31, 2011 2011-2012 [Member] Development Zone A [Member] | Dec. 31, 2011 2011-2012 [Member] Elsewhere In Israel [Member] | Dec. 31, 2011 2013-2014 [Member] Development Zone A [Member] | Dec. 31, 2011 2013-2014 [Member] Elsewhere In Israel [Member] | Dec. 31, 2011 2014 and Thereafter [Member] Development Zone A [Member] | Dec. 31, 2011 2014 and Thereafter [Member] Elsewhere In Israel [Member] | Dec. 31, 2011 Approved Enterprise [Member] USD ($) | Dec. 31, 2011 Privileged Enterprise [Member] USD ($) | Dec. 31, 2011 Minimum [Member] Y | Dec. 31, 2011 Minimum [Member] U.S. State [Member] | Dec. 31, 2011 Minimum [Member] Research And Development Tax Credits [Member] | Dec. 31, 2011 Maximum [Member] Y | Dec. 31, 2011 Maximum [Member] U.S. State [Member] | Dec. 31, 2011 Maximum [Member] Research And Development Tax Credits [Member]
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncertain tax positions interest expense | $ 13,587,000 | $ 10,695,000 | $ 8,239,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncertain tax positions income tax accrual | 48,025,000 | 34,438,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxes payable |  |  |  | 197,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  | 24.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future effective income tax rate | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective real capital gains tax rate | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enacted effective income tax rate | (6.00%) | (8.00%) | (13.00%) |  |  |  |  |  |  |  | 10.00% | 15.00% | 7.00% | 12.50% | 6.00% | 12.00% |  |  | 10.00% |  |  |  |  |
Dividend income tax rate | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investment program granting status |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Number of investment programs ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Amendment of plans for gaining privileged rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | seventh eighth and ninth plans |  |  |  |  |  |
Privileges expiration year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |
Income tax exemption period (in years) | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax period based on foreign investments (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  | 8 |  |
Common shares repurchased, shares | 5,590,000 | 5,650,000 | 7,810,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,831,728 |  |  |  |  |  |
Common shares repurchased, value | 300,000,000 | 200,000,000 | 202,285,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,068,576,000 |  |  |  |  |  |
Retained earnings exempt from tax | 3,973,045,000 | 3,429,079,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 713,007,000 | 1,024,198,000 |  |  |  |  |  |
Income tax liability incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,617,000 | 163,655,000 |  |  |  |  |  |
Fixed assets amortization period (in years) |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of income in tax year from industrial production to be considered an "Industrial Company" in Israel | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings | 93,443,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal loss carryforward |  |  |  |  |  |  |  | 654,000,000 | 665,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards offset period (in years) |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforward expiration years |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |  |  | 2012 | 2019 |  | 2024 | 2028
Compensation expense recognized transferred to additional paid-in capital |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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