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Derivative and Hedging Activities - Derivative Instruments in Balance Sheet Table (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ 262 | $ 282
Commodity contract |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset | 314 | 422
Derivative liability | (52) | (147)
Energy related derivative |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets (liabilities), at fair value, net | 262 | 282
Not designated as hedging instrument | Commodity contract |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset (liability), fair value, gross asset (liability) | 262 | 282
Derivative asset (liability) fair value, net asset (liability), netted | 0 | 0
Derivative assets (liabilities), at fair value, net | 262 | 282
Short-term derivative asset | Not designated as hedging instrument | Commodity contract |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 250 | 306
Derivative asset, fair value, gross liability, netted | (26) | (104)
Derivative asset | 224 | 202
Long-term derivative asset | Not designated as hedging instrument | Commodity contract |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 64 | 117
Derivative asset, fair value, gross liability, netted | (1) | (41)
Derivative asset | 63 | 76
Short-term derivative liability | Not designated as hedging instrument | Commodity contract |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | (48) | (107)
Derivative liability, fair value, gross asset, netted | 26 | 104
Derivative liability | (22) | (3)
Long-term derivative liability | Not designated as hedging instrument | Commodity contract |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | (4) | (41)
Derivative liability, fair value, gross asset, netted | 1 | 41
Derivative liability | (3) | 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 | 0 | 7
Derivative asset, fair value, gross liability, netted | 0 | 0
Derivative asset | $ 0 | $ 7

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