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Debt and Credit Agreements - Cimarex Senior Notes (Details) - Senior Notes - USD ($) $ in Millions | Oct. 07, 2021 | Oct. 01, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal (In millions) | $ 1,800 | $ 2,000
Fair Value |  | 2,196
4.375% senior notes due June 1, 2024 |  |
Debt Instrument [Line Items] |  |
Principal (In millions) |  | 750
Fair Value |  | 809
3.90% senior notes due May 15, 2027 |  |
Debt Instrument [Line Items] |  |
Principal (In millions) |  | 750
Fair Value |  | 823
4.375% senior notes due March 15, 2029 |  |
Debt Instrument [Line Items] |  |
Principal (In millions) |  | 500
Fair Value |  | $ 564

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