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Derivative and Hedging Activities - Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total derivatives | $ (118) | $ 130
Not designated as hedging instrument | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset |  | 130
Derivative liability, fair value, gross liability | (118) |
Derivative liability, fair value, gross asset | 0 | 0
Total derivatives | (118) | 130
Not designated as hedging instrument | Commodity contracts | Short-term derivative asset |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 84 | 174
Derivative asset, fair value, gross liability | (65) | (40)
Total derivatives | 19 | 134
Not designated as hedging instrument | Commodity contracts | Long-term derivative asset |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 5 |
Derivative asset, fair value, gross liability | (5) |
Total derivatives | 0 |
Not designated as hedging instrument | Commodity contracts | Short-term derivative liability |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | (158) | (42)
Derivative liability, fair value, gross asset | 65 | 40
Total derivatives | (93) | (2)
Not designated as hedging instrument | Commodity contracts | Long-term derivative liability |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | (49) | (2)
Derivative liability, fair value, gross asset | 5 | 0
Total derivatives | $ (44) | $ (2)

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