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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current income tax provision (benefit) [Abstract]      
Federal $ (107,834) $ (152,258) $ (303,853)
State 6,790 10,819 17,048
Foreign 40,248 81,426 65,615
Total (60,796) (60,013) (221,190)
Deferred income tax provision (benefit) [Abstract]      
Federal (153,027) 626,901 862,075
State (15,400) 32,541 43,293
Foreign (17,963) (27,784) (11,212)
Total (186,390) 631,658 894,156
Other Non-Current (1)      
Federal 112,704 [1] 245,125 [2] 148,992 [1]
Other Noncurrent Foreign Income Tax 0 (6,413) 0
Total 112,704 238,712 148,992
Income Tax Provision (Benefit) (134,482) 810,357 $ 821,958
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract]      
Foreign Oil and Gas Exploration and Development Costs Deducted for Tax Under Book Depreciation, Depletion and Amortization 25,129 5,825  
Foreign Net Operating Loss 74,280 66,675  
Foreign Valuation Allowances (97,499) (70,455)  
Foreign Other 217 318  
Total Net Noncurrent Deferred Income Tax Assets 2,127 2,363  
Deferred tax liabilities net noncurrent classification [Abstract]      
Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization 5,028,010 5,277,550  
Commodity Hedging Contracts 14,518 (4,699)  
Deferred Compensation Plans (42,594) (47,650)  
Accrued Expenses and Liabilities 0 (8,502)  
Equity Awards (102,944) (108,324)  
Alternative Minimum Tax Credit Carryforward 0 (31,904)  
Undistributed Foreign Earnings 9,843 15,746  
Other (47,506) (46,116)  
Total Net Noncurrent Deferred Income Tax Liabilities 4,859,327 5,046,101  
Total Net Deferred Income Tax Liabilities $ 4,857,200 $ 5,043,738  
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory Federal Income Tax Rate (in hundredths) 21.00% 21.00% 21.00%
State Income Tax, Net of Federal Benefit (in hundredths) 0.92% 0.97% 1.12%
Income Tax Provision Related to Foreign Operations (in hundredths) (0.09%) 0.87% 0.51%
Income Tax Provision Related to Canadian Operations (in hundredths) (2.43%) 0.00% 0.00%
TCJA (in hundredths) 0.00% 0.00% [3],[4] (2.60%) [4]
Shared-Based Compensation (in hundredths) (2.94%) 0.02% (0.47%)
Other (in hundredths) 1.74% 0.00% (0.18%)
Effective Income Tax Rate (in hundredths) 18.20% 22.86% 19.38%
Tax NOLs (in hundredths)     (1.20%)
Sequestration (in hundredths)     (1.00%)
Other Tax Reform Impacts (in hundredths)     (0.40%)
Income Tax Disclosure [Abstract]      
Balance of state net operating loss expected to be carried forward $ 1,900,000    
Canadian Net Operating Loss Carryforwards 275,000    
Unrecognized Tax Benefits Balance 10,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0    
Foreign and State Deferred Income Taxes 10,000    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 29,000    
Earnings Decrease Due to Settlement of Uncertain Tax Positions 5,000    
Results of Operations, Income before Income Taxes [Abstract]      
United States (756,479) $ 3,466,578 $ 4,084,156
Foreign 17,425 78,689 156,842
Income (Loss) Before Income Taxes (739,054) 3,545,267 4,240,998
Valuation Allowance [Abstract]      
Beginning Balance 200,831 167,142 466,421
Increase [5] 25,573 30,673 23,062
Decrease [6] (11,343) (75) (26,219)
Other [7] 3,942 3,091 (296,122)
Ending Balance $ 219,003 $ 200,831 $ 167,142
[1] Includes changes in certain amounts that are expected to be paid or received beyond the next twelve months. The primary component is refundable alternative minimum tax (AMT) credits.
[2] Includes changes in certain amounts that are expected to be paid or received beyond the next twelve months. The primary component is refundable alternative minimum tax (AMT) credits.
[3] Includes impact of utilizing certain tax net operating losses (NOLs) ((1.2)%), the reversal of the federal sequestration charge ((1.0)%) and other TCJA impacts ((0.4)%).
[4] The Tax Cuts and Jobs Act (TCJA) was enacted in 2017 and required certain measurement-period adjustments in 2018.
[5] Increase in valuation allowance related to the generation of tax NOLs and other deferred tax assets.
[6] Decrease in valuation allowance associated with adjustments to certain deferred tax assets and their related allowances.
[7] Represents dispositions, revisions and/or foreign exchange rate variances and the effect of statutory income tax rate changes. The United Kingdom operations were sold in the fourth quarter of 2018.