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Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 07, 2021 | Mar. 31, 2022 USD ($) a | Mar. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash |  | $ 166 | $ 195
Barnett Shale [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash payments for divestitures |  | 10 |
Canada [Member] | Barnett Shale [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash |  | $ 150 |
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% |
Catalyst [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Area of land | a |  | 50,000 |

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