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DERIVATIVES - FAIR VALUE (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Oil Collars and Calls | Other current assets |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, asset | $ 0 | $ 0
Total fair value, asset | 25 | 92
Oil Collars and Calls | Other current assets | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 0 | 0
Oil Collars and Calls | Other current assets | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 25 | 92
Oil Collars and Calls | Other current assets | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 0 | 0
Oil Collars and Calls | Accrued liabilities |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability | 0 |
Total fair value, liability | (42) |
Oil Collars and Calls | Accrued liabilities | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 |
Oil Collars and Calls | Accrued liabilities | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | (42) |
Oil Collars and Calls | Accrued liabilities | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 |
Oil Collars and Calls | Deferred credits and other liabilities - other |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability |  | 0
Total fair value, liability |  | (160)
Oil Collars and Calls | Deferred credits and other liabilities - other | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross |  | 0
Oil Collars and Calls | Deferred credits and other liabilities - other | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross |  | (160)
Oil Collars and Calls | Deferred credits and other liabilities - other | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross |  | 0
Marketing Derivatives |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Initial margin | 85 | 65
Marketing Derivatives | Other current assets |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, asset | (1,204) | (973)
Total fair value, asset | 31 | 51
Marketing Derivatives | Other current assets | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 1,155 | 945
Marketing Derivatives | Other current assets | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 80 | 79
Marketing Derivatives | Other current assets | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 0 | 0
Marketing Derivatives | Long-term receivables and other assets, net |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, asset | (7) | (4)
Total fair value, asset | 2 | 12
Marketing Derivatives | Long-term receivables and other assets, net | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 7 | 4
Marketing Derivatives | Long-term receivables and other assets, net | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 2 | 12
Marketing Derivatives | Long-term receivables and other assets, net | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross | 0 | 0
Marketing Derivatives | Accrued liabilities |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability | 1,204 | 973
Total fair value, liability | (129) | (79)
Marketing Derivatives | Accrued liabilities | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | (1,252) | (1,008)
Marketing Derivatives | Accrued liabilities | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | (81) | (44)
Marketing Derivatives | Accrued liabilities | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 | 0
Marketing Derivatives | Deferred credits and other liabilities - other |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability | 7 | 4
Total fair value, liability | 0 | (1)
Marketing Derivatives | Deferred credits and other liabilities - other | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | (7) | (4)
Marketing Derivatives | Deferred credits and other liabilities - other | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 | (1)
Marketing Derivatives | Deferred credits and other liabilities - other | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 | 0
Interest Rate Swaps |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Collateral paid netted against derivative liabilities | 374 |
Interest Rate Swaps | Other current assets |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, asset |  | 0
Total fair value, asset |  | 5
Interest Rate Swaps | Other current assets | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross |  | 0
Interest Rate Swaps | Other current assets | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross |  | 5
Interest Rate Swaps | Other current assets | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross |  | 0
Interest Rate Swaps | Long-term receivables and other assets, net |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, asset |  | 0
Total fair value, asset |  | 5
Interest Rate Swaps | Long-term receivables and other assets, net | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross |  | 0
Interest Rate Swaps | Long-term receivables and other assets, net | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross |  | 5
Interest Rate Swaps | Long-term receivables and other assets, net | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative asset, gross |  | 0
Interest Rate Swaps | Accrued liabilities |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability | 0 | 0
Total fair value, liability | (936) | (657)
Interest Rate Swaps | Accrued liabilities | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 | 0
Interest Rate Swaps | Accrued liabilities | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | (936) | (657)
Interest Rate Swaps | Accrued liabilities | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 | 0
Interest Rate Swaps | Deferred credits and other liabilities - other |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability | 0 | 0
Total fair value, liability | (822) | (776)
Interest Rate Swaps | Deferred credits and other liabilities - other | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | 0 | 0
Interest Rate Swaps | Deferred credits and other liabilities - other | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | (822) | (776)
Interest Rate Swaps | Deferred credits and other liabilities - other | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross | $ 0 | 0
Berkshire Warrants | Deferred credits and other liabilities - other |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Netting, liability |  | 0
Total fair value, liability |  | (107)
Berkshire Warrants | Deferred credits and other liabilities - other | Level 1 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross |  | 0
Berkshire Warrants | Deferred credits and other liabilities - other | Level 2 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross |  | (107)
Berkshire Warrants | Deferred credits and other liabilities - other | Level 3 |  |
Gross and net fair values of outstanding derivatives (in millions) |  |
Commodity contract derivative liability, gross |  | $ 0

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