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Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Commodity Contract - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Natural Gas | Natural Gas Swaps |  |
Financial Assets: |  |
Assets, fair value disclosure |  | $ 1
Natural Gas | Natural Gas Swaps | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure |  | 0
Natural Gas | Natural Gas Swaps | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure |  | 1
Natural Gas | Natural Gas Swaps | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure |  | 0
Natural Gas | Price Swaps |  |
Financial Assets: |  |
Assets, fair value disclosure | $ 16 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 36 | 117
Natural Gas | Price Swaps | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 | 0
Natural Gas | Price Swaps | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure | 16 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 36 | 117
Natural Gas | Price Swaps | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 | 0
Natural Gas | Collar |  |
Financial Assets: |  |
Assets, fair value disclosure | 5 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 4 |
Natural Gas | Collar | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 |
Natural Gas | Collar | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure | 5 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 4 |
Natural Gas | Collar | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 |
Brent Crude Oil (Brent) Linked Gas Sales Contract |  |
Financial Assets: |  |
Assets, fair value disclosure | 65 |
Brent Crude Oil (Brent) Linked Gas Sales Contract | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Brent Crude Oil (Brent) Linked Gas Sales Contract | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Brent Crude Oil (Brent) Linked Gas Sales Contract | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure | 65 |
Brent Linked Gas Sales Contract |  |
Financial Assets: |  |
Assets, fair value disclosure |  | 110
Brent Linked Gas Sales Contract | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure |  | 0
Brent Linked Gas Sales Contract | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure |  | 0
Brent Linked Gas Sales Contract | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure |  | $ 110
Natural Gas Liquids | Price Swaps |  |
Financial Assets: |  |
Assets, fair value disclosure | 1 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 1 |
Natural Gas Liquids | Price Swaps | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 0 |
Natural Gas Liquids | Price Swaps | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Assets, fair value disclosure | 1 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | 1 |
Natural Gas Liquids | Price Swaps | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Assets, fair value disclosure | 0 |
Financial Liabilities: |  |
Liabilities, fair value disclosure | $ 0 |

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