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Derivative and Hedging Activities - Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total derivatives | $ 130 | $ 282
Energy related derivative |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives | 130 | 282
Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 130 |
Derivative liability, fair value, gross asset | 0 |
Total derivatives | 130 |
Not designated as hedging instrument | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability |  | 282
Derivative liability, fair value, gross asset |  | 0
Total derivatives |  | 282
Short-term derivative asset | Not designated as hedging instrument | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 174 | 306
Derivative asset, fair value, gross liability | (40) | (104)
Total derivatives | 134 | 202
Long-term derivative asset | Not designated as hedging instrument | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset |  | 117
Derivative asset, fair value, gross liability |  | (41)
Total derivatives |  | 76
Short-term derivative liability | Not designated as hedging instrument | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | (42) | (107)
Derivative liability, fair value, gross asset | 40 | 104
Total derivatives | (2) | (3)
Long-term derivative liability | Not designated as hedging instrument | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | (2) | (41)
Derivative liability, fair value, gross asset | 0 | 41
Total derivatives | $ (2) | 0
Future natural gas prices | Short-term derivative asset | Not designated as hedging instrument | Energy related derivative |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset |  | 7
Derivative asset, fair value, gross liability |  | 0
Total derivatives |  | $ 7

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