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DERIVATIVES - NARRATIVE (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) $ / bbl | Dec. 31, 2021 USD ($) $ / Mcfe | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / bbl | Dec. 31, 2020 USD ($) $ / Mcfe | Dec. 31, 2019 USD ($) | Jun. 26, 2020 $ / shares shares | May 29, 2020 shares | Aug. 08, 2019 $ / shares shares
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash payments | $ 834.0 |  |  | $ 362.0 |  |  | $ (120.0) |  |  |
Net cash payments related to settlements | 885.0 |  |  |  |  |  |  |  |  |
Not designated as hedging instruments |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed, net of collateral | 107.0 | $ 107.0 | $ 107.0 | 104.0 | $ 104.0 | $ 104.0 |  |  |  |
Amount of collateral posted related to derivative instruments with credit-risk-related contingent features | 323.0 | 323.0 | 323.0 | 374.0 | 374.0 | 374.0 |  |  |  |
Gas Puts and Calls |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash payments | 152.0 |  |  |  |  |  |  |  |  |
Oil Collars and Calls |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash payments |  |  |  | 146.0 |  |  |  |  |  |
Net cash receipts related to settlements |  |  |  | 960.0 |  |  |  |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash payments | 815.0 |  |  |  |  |  |  |  |  |
Collateral returned | 51.0 |  |  |  |  |  |  |  |  |
Collateral returned netted against derivative liabilities | 323.0 | 323.0 | 323.0 | $ 374.0 | $ 374.0 | $ 374.0 |  |  |  |
Interest Rate Swap, 6.348% |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | $ 400.0 | $ 400.0 | $ 400.0 |  |  |  |  |  |  |
Weighted average interest rate | 6.348% | 6.348% | 6.348% |  |  |  |  |  |  |
Interest Rate Swap, 6.662% |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | $ 350.0 | $ 350.0 | $ 350.0 |  |  |  |  |  |  |
Weighted average interest rate | 6.662% | 6.662% | 6.662% |  |  |  |  |  |  |
Marketing Derivatives | Not designated as hedging instruments |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average sales price (in dollars per share) |  | 74.85 | 4.61 |  | 46.05 | 2.58 |  |  |  |
Berkshire Warrants | Common Stock |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  |  |  |  |  |  |  | 3.9 |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 59.624 |  |
Berkshire Warrants | Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  |  |  |  |  |  |  |  | 103.0 |
Berkshire Warrants | Anadarko Petroleum Corporation | Common Stock |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 80.0
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 62.50

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