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Summary of Significant Accounting Policies (Narrative) (Details) shares in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 27, 2024 USD ($) shares | Sep. 30, 2024 USD ($) a | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) a | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Gain loss on disposition of assets |  | $ (0) | $ 0 |  | $ (16) | $ 41 |
Williston Acquisition [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Asset, Total | $ 5,000 |  |  |  |  |  |
Cash paid related to acquisition | $ 3,500 |  |  |  |  |  |
Common Stock [Member] | Williston Acquisition [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shares sold in acquisition | shares | 37.3 |  |  |  |  |  |
Devon Energy Corporation [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Voting interest in the joint venture legal entity |  | 30.00% |  |  | 30.00% |  |
Devon Energy Corporation [Member] | Waterbridge |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Voting interest in the joint venture legal entity |  | 70.00% |  |  | 70.00% |  |
Water JV [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Gain loss on disposition of assets |  |  |  | $ 64 |  |  |
WPX and Howard Energy Partners [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Voting interest in the joint venture legal entity |  | 50.00% |  |  | 50.00% |  |
Catalyst [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Area of land | a |  | 50,000 |  |  | 50,000 |  |
Fervo [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Investment |  |  |  |  |  |  | $ 100
Commitment amount funded |  |  |  |  | $ 78 |  |
Committed to making additional investments |  | $ 22 |  |  | $ 22 |  |

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