Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] 5.875 Notes Due 2027 5.875 Notes Due 2027 [Member] 5.875 Notes Due 2027 Title of 12(b) Security Title of 12(b) Security October 1, 2025 October 1, 2025 [Member] October 1, 2025 Document Fiscal Year Focus Document Fiscal Year Focus Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Segment Reporting [Abstract] Common Stock, par $1.00, authorized 450,000,000 shares, issued 195,100,628 shares at June 30, 2026 and 195,100,628 shares at December 31, 2025 Common Stock, Value, Issued Additions pending the determination of proved reserves Oil and Gas, Capitalized Exploratory Well Cost, Addition Pending Determination of Proved Reserve Withholding 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Including Discontinued Operation [Abstract] Total revenue from sales to customers Revenue from production Revenue from Contract with Customer, Excluding Assessed Tax Property, plant and equipment, at cost less accumulated depreciation, depletion and amortization of $15,470,662 in 2026 and $15,068,149 in 2025 Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Interest cost Defined Benefit Plan, Interest Cost Well costs incurred and expensed Well Costs Incurred And Expensed Well Costs Incurred And Expensed Other operating expenses Other Operating Income (Expense), Net, Adjustment Other Operating Income (Expense), Net, Adjustment Retirement and postretirement benefit plans, net of income taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Less: 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and amortization Depreciation, Depletion and Amortization, Adjustment Depreciation, Depletion and Amortization, Adjustment Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Transportation, gathering and processing Transportation, Gathering and Processing Costs Transportation, Gathering and Processing Costs Aging of Capitalized Exploratory Well Costs [Axis] Oil and Gas, Capitalized Exploratory Well Cost, Capitalized for Period Greater than One Year, Aging [Axis] Recognized actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Revisions of previous estimates Asset Retirement Obligation, Revision of Estimate New Accounting Principles and Recent 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Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Number of reportable segments not disclosed flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Schedule of Current Long-Term Contracts Outstanding Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Restricted stock transactions and other Stock Issued During Period, Value, Restricted Stock Award, Gross 6.375 Notes Due 2028 6.375 Notes Due 2028 [Member] 6.375 Notes Due 2028 Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Time-based RSUs (Stock-Settled) Time Based Restricted Stock Units [Member] Time-Based Restricted Stock Units [Member] Well costs Beginning balance Ending balance Amount Oil and Gas, Capitalized Exploratory Well Cost Revenues and other income Revenues [Abstract] Other exploratory costs, including undeveloped lease amortization and delay lease rentals Oil and Gas, Result of Operation, Expense, Other One to two years Oil and Gas, Capitalized Exploratory Well Cost, Capitalized for Period Greater than One Year, Aging, Period Two [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]