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Announced Acquisition of Concho Resources Inc. (Details) $ in Millions | Oct. 19, 2020 USD ($) | Sep. 30, 2020 USD ($)
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Subsequent Event [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  | $ 3,900.0
Subsequent Event [Member] | Concho Resources Inc. [Member] | Scenario Plan [Member] |  |
Subsequent Event [Line Items] |  |
Business Acquisition, Date of Acquisition Agreement | Oct. 19, 2020 |
Business Acquisition, Name of Acquired Entity | Concho Resources Inc. |
Payments to Acquire Businesses, Gross | $ 9,700.0 |
Subsequent Event [Member] | Concho Resources Inc. [Member] | Scenario Plan [Member] | Merger Agreement Termination [Member] |  |
Subsequent Event [Line Items] |  |
Business Exit Costs | 450.0 |
Subsequent Event [Member] | Concho Resources Inc. [Member] | Scenario Plan [Member] | Reimbursement Of Acquiree Merger Related Costs [Member] |  |
Subsequent Event [Line Items] |  |
Business Exit Costs | $ 142.5 |
Subsequent Event [Member] | Concho Resources Inc. [Member] | Scenario Plan [Member] | Common Stock [Member] |  |
Subsequent Event [Line Items] |  |
Stock For Stock Exchange Fixed Ratio | 1.46 |

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