v2.4.0.6

Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred tax assets net noncurrent classification [Abstract] |  |  |
Foreign Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization | $ 25,592,000 | $ (57,850,000) |
Foreign Net Operating Loss | 164,829,000 | 62,477,000 |
Foreign Other | 1,607,000 | 314,000 |
Foreign Valuation Allowances | (134,792,000) | 0 |
Total Net Noncurrent Deferred Income Tax Assets | 57,236,000 | 4,941,000 |
Deferred tax liabilities net current classification [Abstract] |  |  |
Commodity Hedging Contracts | 57,754,000 | 158,302,000 |
Deferred Compensation Plans | (35,715,000) | (28,346,000) |
Timing Differences Associated With Different Year-ends in Foreign Jurisdictions | 2,762,000 | 6,251,000 |
Other | (1,963,000) | (218,000) |
Total Net Current Deferred Income Tax Liabilities | 22,838,000 | 135,989,000 |
Deferred tax liabilities net noncurrent classification [Abstract] |  |  |
Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization | 5,300,115,000 | 5,485,436,000 |
Non-Producing Leasehold Costs | (61,512,000) | (66,926,000) |
Seismic Costs Capitalized for Tax | (125,026,000) | (111,862,000) |
Equity Awards | (116,666,000) | (120,852,000) |
Capitalized Interest | 102,677,000 | 106,265,000 |
Net Operating Loss | (308,154,000) | (1,152,386,000) |
Alternative Minimum Tax Credit Carryforward | (476,505,000) | (298,350,000) |
Other | 12,467,000 | 25,894,000 |
Total Net Noncurrent Deferred Income Tax Liabilities | 4,327,396,000 | 3,867,219,000 |
Total Net Deferred Income Tax Liabilities | 4,292,998,000 | 3,998,267,000 |
Income Before Income Taxes [Abstract] |  |  |
United States | 1,988,105,000 | 2,156,147,000 | 646,495,000
Foreign | (707,365,000) | (246,348,000) | (238,519,000)
Income Before Income Taxes | 1,280,740,000 | 1,909,799,000 | 407,976,000
Current income tax provision [Abstract] |  |  |
Federal | 242,674,000 | 94,244,000 | 17,154,000
State | 22,573,000 | 1,083,000 | (1,642,000)
Foreign | 152,276,000 | 224,049,000 | 155,565,000
Total | 417,523,000 | 319,376,000 | 171,077,000
Deferred income tax provision [Abstract] |  |  |
Federal | 454,173,000 | 608,181,000 | 190,602,000
State | 632,000 | 40,321,000 | 60,619,000
Foreign | (161,867,000) | (149,202,000) | (174,976,000)
Total | 292,938,000 | 499,300,000 | 76,245,000
Income Tax Provision | 710,461,000 | 818,676,000 | 247,322,000
Effective income tax rate [Abstract] |  |  |
Statutory Federal Income Tax Rate (in hundredths) | 35.00% | 35.00% | 35.00%
State Income Tax, Net of Federal Benefit (in hundredths) | 1.18% | 1.41% | 9.39%
Income Tax Provision Related to Foreign Operations (in hundredths) | 1.38% | 0.88% | (0.03%)
Income Tax Provision Related to Trinidad Operations (in hundredths) | (0.27%) | 3.37% | 6.26%
Canadian Valuation Allowances (in hundredths) | 10.57% | 0.00% | 0.00%
Canadian Shallow Natural Gas Impairments (in hundredths) | 6.90% | 1.85% | 9.49%
Other (in hundredths) | 0.71% | 0.36% | 0.51%
Effective Income Tax Rate (in hundredths) | 55.47% | 42.87% | 60.62%
Unrecognized tax benefits balance | 33,000,000 |  |
Foreign subsidiaries' undistributed earnings | 2,500,000,000 |  |
Regular tax net operating loss utilized | 939,000,000 |  |
Balance of federal net operating loss expected to be carried forward | 932,000,000 |  |
Balance of federal net operating loss generated in 2011 | 444,000,000 |  |
Balance of federal net operating loss generated in 2010 | 488,000,000 |  |
State Income Tax Net Operating Losses | 800,000,000 |  |
Tax benefit reflected in additional paid-in-capital due to current year utilization of net operating losses | 11,000,000 |  |
Additional tax benefit to be reflected in additional paid-in-capital due to future utilization of net operating losses | 29,000,000 |  |
Alternative minimum tax paid | 187,000,000 |  |
AMT Paid In Years Prior To Prior Reporting Period | 289,000,000 |  |
Tax net operating loss incurred in United Kingdom in current year | 159,000,000 |  |
Balance of tax net operating loss incurred in the United Kingdom in prior years | $ 104,000,000 |  |

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