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Employee Benefit Plans - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2021 USD ($) | Dec. 31, 2021 USD ($) shares | Dec. 31, 2021 USD ($) Retiree shares | Dec. 31, 2020 USD ($) Retiree | Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of retirees and dependents | Retiree |  |  | 364 | 337 |
Subsidy limit percentage of expected annual fully insured premium over age threshold |  |  | 60.00% |  |
Subsidy limit percentage of expected annual fully insured premium under age threshold |  |  | $ 648,000 |  |
Annual subsidy limit percentage increases for fully insured premium over age threshold |  |  | 3.50% |  |
Estimated contributions next year |  | $ 2,000,000 | $ 2,000,000 |  |
Defined contribution cost recognized |  |  | 1,000,000 |  |
Liabilities, including common stock |  | 56,000,000 | 56,000,000 | $ 31,000,000 |
Compensation (benefit) expense |  |  | $ 1,000,000 | (1,000,000) | $ (2,000,000)
Cimarex |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Distributions paid |  | 27,000,000 |  |  |
Deferred compensation liability | $ 27,000,000 |  |  |  |
Executive Officer |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Contributions to deferred compensation plan | $ 19,000,000 |  |  |  |
Savings Investment Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Employer matching percent |  |  | 6.00% |  |
Maximum contribution, percent of employee salary |  |  | 10.00% |  |
401(k) Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Employer matching percent |  |  | 7.00% |  |
Defined contribution cost recognized |  |  | $ 7,000,000 | 6,000,000 | 6,000,000
Deferred Compensation Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Market value of the trust assets, excluding common stock |  |  | 47,000,000 | 22,000,000 |
Liabilities, including common stock |  | $ 56,000,000 | $ 56,000,000 | 31,000,000 |
Number of common stock deferred into the rabbi trust (in shares) | shares |  | 495,774 | 495,774 |  |
Common stock held in rabbi trust |  | $ 5,000,000 | $ 5,000,000 | 5,000,000 |
Contributions to deferred compensation plan |  |  | $ 20,000,000 | $ 1,000,000 | $ 1,000,000

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- Definition Represents the number of retired employees, including their spouses, eligible dependents and surviving spouses (retirees), to whom Company provides benefits under the plan. + References No definition available. + Details
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- Definition Represents the entity's subsidy which is limited to the percentage of the expected annual fully-insured premium. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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