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Acquisition and Divestitures (Narrative) (Details) shares in Millions, $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2024 USD ($) shares | Sep. 30, 2025 USD ($) $ / MMBTU $ / bbl shares | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) shares
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Investments |  | $ 679 |  | $ 727
Common stock, shares issued (in shares) | shares |  | 629.0 |  | 651.0
Barnett Shale [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Contingent earnout payments |  | $ 20 | $ 20 |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  | 2.75 |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  | 50 |  |
Contingent earnout payment period |  | The contingent payment period commenced on January 1, 2021, and had a term of four years. |  |
Williston Acquisition [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Total consideration for business acquired | $ 5,000 |  |  |
Cash paid related to acquisition | $ 3,500 |  |  |
Williston Acquisition [Member] | Common Stock [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Common stock, shares issued (in shares) | shares | 37.3 |  |  |
Matterhorn [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Investments |  | $ 372 |  |
Gain on sale of investment |  | 307 |  |
Gain (Loss) on Investments |  | $ 239 |  |

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