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Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 07, 2021 | Sep. 30, 2021 USD ($) a | Sep. 30, 2021 USD ($) a | Sep. 30, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Conversion of common stock into right to recieve per share | 0.5165 |  | 0.5165 |
Restricted cash |  | $ 177 | $ 177 | $ 190
Barnett Shale [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash |  | 165 | $ 165 |
Cash payments for divestitures |  | $ 10 |  |
Devon and WPX Agreement [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Date of agreement | Jan. 07, 2021 |  | Jan. 07, 2021 |
Conversion of common stock into right to recieve per share | 0.5165 |  |  |
WPX and Howard Energy Partners [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Voting interest in the join venture legal entity |  | 50.00% | 50.00% |
Catalyst [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Area of land | a |  | 50,000 | 50,000 |

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