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Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Commodity Contract - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Natural Gas | Basis Swaps |  |
Financial Assets: |  |
Assets, fair value disclosure | $ 1 | $ 1
Natural Gas | Basis Swaps | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 | 0
Natural Gas | Basis Swaps | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure | 1 | 1
Natural Gas | Basis Swaps | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 | 0
Natural Gas | Price Swaps |  |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 86 | 117
Natural Gas | Price Swaps | Quoted Prices in Active Markets (Level 1) |  |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 | 0
Natural Gas | Price Swaps | Significant Other Observable Inputs (Level 2) |  |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 86 | 117
Natural Gas | Price Swaps | Significant Unobservable Inputs (Level 3) |  |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 | 0
Brent Crude Oil (Brent) Linked Gas Sales Contract |  |
Financial Assets: |  |
Assets, fair value disclosure | 56 | 110
Brent Crude Oil (Brent) Linked Gas Sales Contract | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 | 0
Brent Crude Oil (Brent) Linked Gas Sales Contract | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 | 0
Brent Crude Oil (Brent) Linked Gas Sales Contract | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure | $ 56 | $ 110

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