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Derivatives - Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Collateral related to marketing derivatives | $ 78 | $ 85
Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Collateral paid netted against derivative liabilities | 326 | 374
Accrued liabilities | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Netting and collateral, liability | 0 | 0
Total net fair value, liability | (249) | (42)
Accrued liabilities | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Netting and collateral, liability | 1,679 | 1,204
Total net fair value, liability | (130) | (129)
Accrued liabilities | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Netting and collateral, liability | 0 | 0
Total net fair value, liability | (823) | (936)
Other current assets | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Netting, asset |  | 0
Total net fair value, asset |  | 25
Other current assets | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Netting, asset | (1,679) | (1,204)
Total net fair value, asset | 17 | 31
Long-term receivables and other assets, net | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Netting, asset | (100) | (7)
Total net fair value, asset | 2 | 2
Deferred credits and other liabilities - other | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Netting and collateral, liability | 100 | 7
Total net fair value, liability | (1) | 0
Deferred credits and other liabilities - other | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Netting and collateral, liability | 0 | 0
Total net fair value, liability | (710) | (822)
Level 1 | Accrued liabilities | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 1 | Accrued liabilities | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | (1,696) | (1,252)
Level 1 | Accrued liabilities | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 1 | Other current assets | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross |  | 0
Level 1 | Other current assets | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross | 1,584 | 1,155
Level 1 | Long-term receivables and other assets, net | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross | 100 | 7
Level 1 | Deferred credits and other liabilities - other | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | (101) | (7)
Level 1 | Deferred credits and other liabilities - other | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 2 | Accrued liabilities | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | (249) | (42)
Level 2 | Accrued liabilities | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | (113) | (81)
Level 2 | Accrued liabilities | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | (823) | (936)
Level 2 | Other current assets | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross |  | 25
Level 2 | Other current assets | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross | 112 | 80
Level 2 | Long-term receivables and other assets, net | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross | 2 | 2
Level 2 | Deferred credits and other liabilities - other | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 2 | Deferred credits and other liabilities - other | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | (710) | (822)
Level 3 | Accrued liabilities | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 3 | Accrued liabilities | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 3 | Accrued liabilities | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 3 | Other current assets | Collars and Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross |  | 0
Level 3 | Other current assets | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross | 0 | 0
Level 3 | Long-term receivables and other assets, net | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative asset, gross | 0 | 0
Level 3 | Deferred credits and other liabilities - other | Marketing Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | 0 | 0
Level 3 | Deferred credits and other liabilities - other | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Commodity contract derivative liability, gross | $ 0 | $ 0

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