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Debt and Credit Agreements - Narrative (Details) |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 07, 2021 USD ($) | Sep. 16, 2021 | Apr. 22, 2019 | May 31, 2016 USD ($) | Sep. 30, 2014 USD ($) Tranche Investor | Dec. 31, 2010 USD ($) Tranche Investor | Jul. 31, 2008 USD ($) Tranche Investor | Dec. 31, 2021 USD ($) fiscal_period | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 01, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 288,000,000 | $ 283,000,000 | $ 102,000,000 |
6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  |  | $ 64,000,000 |  |  |  |  |  |  |
Repayments of debt |  |  |  | 68,000,000 |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  |  | 6.51% |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 37,000,000 | 37,000,000 |  |
5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  |  |  |  |  |  | $ 88,000,000 |  |  |
Weighted-average interest rate |  |  |  |  |  |  |  | 5.58% |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 87,000,000 | 175,000,000 |  |
3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
Weighted-average interest rate |  |  |  |  |  |  |  | 3.65% |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 825,000,000 | $ 925,000,000 |  |
Existing Cimarex Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Converted debt |  |  |  |  |  |  |  | $ 174,000,000 |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fiscal quarters for reduction in coverage ratio | fiscal_period |  |  |  |  |  |  |  | 4 |  |  |
Minimum required annual coverage ratio |  |  |  |  |  |  |  | 2.8 |  |  |
Consolidated debt to EBIDTA ratio |  |  |  |  |  |  |  | 3.0 |  |  |
Principal (In millions) | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  | $ 2,000,000,000
Cash consideration | 2,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | Cimarex |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  | $ 425,000,000 |  |  |  |
Number of institutional investors | Investor |  |  |  |  |  |  | 41 |  |  |  |
Number of debt tranches | Tranche |  |  |  |  |  |  | 3 |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 388,000,000 |  |  |
Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  | $ 175,000,000 |  |  |  |  |
Number of institutional investors | Investor |  |  |  |  |  | 8 |  |  |  |  |
Number of debt tranches | Tranche |  |  |  |  |  | 3 |  |  |  |  |
Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  | $ 925,000,000 |  |  |  |  |  |
Number of institutional investors | Investor |  |  |  |  | 24 |  |  |  |  |  |
Number of debt tranches | Tranche |  |  |  |  | 3 |  |  |  |  |  |
Senior Notes | 4.375% Senior Notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  |  | $ 706,000,000 |  |  |
Stated percentage |  |  |  |  |  |  |  | 4.375% |  |  |
Senior Notes | 3.90% Senior Notes due 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  |  | $ 687,000,000 |  |  |
Stated percentage |  |  |  |  |  |  |  | 3.90% |  |  |
Senior Notes | 4.375% Senior Notes due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  |  | $ 433,000,000 |  |  |
Stated percentage |  |  |  |  |  |  |  | 4.375% |  |  |
Revolving Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum required asset coverage ratio |  | 3.0 |  |  |  |  |  |  |  |  |
Total capitalization |  | 65.00% |  |  |  |  |  |  |  |  |
Agreement extended period |  | 1 year |  |  |  |  |  |  |  |  |
Lenders holding percent |  | 50.00% |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 0 |  |  |
Remaining borrowing capacity on line of credit |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |
Minimum | Revolving Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 12.50% |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | Revolving credit facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 112.50% |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | Revolving credit facility | ABR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 12.50% |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 27.50% |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | Revolving credit facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 175.00% |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | Revolving credit facility | ABR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 75.00% |  |  |  |  |  |  |  |
Tranche 1 | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  |  | 8,000,000 |  |  |  |  |  |  |
Tranche 1 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  | $ 245,000,000 |  |  |  |
Stated percentage |  |  |  |  |  |  | 6.44% |  |  |  |
Tranche 1 | Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  | $ 88,000,000 |  |  |  |  |
Stated percentage |  |  |  |  |  | 5.42% |  |  |  |  |
Tranche 1 | Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  | $ 100,000,000 |  |  |  |  |  |
Stated percentage |  |  |  |  | 3.24% |  |  |  |  |  |
Tranche 2 | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  |  | 13,000,000 |  |  |  |  |  |  |
Tranche 2 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  | $ 100,000,000 |  |  |  |
Stated percentage |  |  |  |  |  |  | 6.54% |  |  |  |
Tranche 2 | Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  | $ 25,000,000 |  |  |  |  |
Stated percentage |  |  |  |  |  | 5.59% |  |  |  |  |
Tranche 2 | Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  | $ 575,000,000 |  |  |  |  |  |
Stated percentage |  |  |  |  | 3.67% |  |  |  |  |  |
Tranche 3 | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  |  | $ 43,000,000 |  |  |  |  |  |  |
Tranche 3 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  |  | $ 80,000,000 |  |  |  |
Stated percentage |  |  |  |  |  |  | 6.69% |  |  |  |
Tranche 3 | Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  |  | $ 62,000,000 |  |  |  |  |
Stated percentage |  |  |  |  |  | 5.80% |  |  |  |  |
Tranche 3 | Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal (In millions) |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Stated percentage |  |  |  |  | 3.77% |  |  |  |  |  |

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