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Derivative and Hedging Activities - Derivative Instruments Table (Details) gal in Millions, MMBbls in Millions, $ in Millions, MMBTU in Trillions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) MMBTU gal MMBbls | Dec. 31, 2017 USD ($) MMBTU gal MMBbls
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ (338) | $ (35)
Energy related derivative [Member] |  |
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ (338) | $ (35)
Energy related derivative [Member] | Oil [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 29 | 36
Derivative assets (liabilities), at fair value, net | $ (300) | $ (183)
Energy related derivative [Member] | Oil [Member] | Fixed-Price Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 21 | 21
Derivative assets (liabilities), at fair value, net | $ (294) | $ (151)
Energy related derivative [Member] | Oil [Member] | Three Way Collar [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 0 | 2
Derivative assets (liabilities), at fair value, net | $ (8) | $ (10)
Energy related derivative [Member] | Oil [Member] | Call Swaption [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 0 | 2
Derivative assets (liabilities), at fair value, net | $ 0 | $ (13)
Energy related derivative [Member] | Oil [Member] | Basis Protection Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 8 | 11
Derivative assets (liabilities), at fair value, net | $ 2 | $ (9)
Energy related derivative [Member] | Natural gas [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 658 | 754
Derivative assets (liabilities), at fair value, net | $ (23) | $ 150
Energy related derivative [Member] | Natural gas [Member] | Fixed-Price Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 400 | 532
Derivative assets (liabilities), at fair value, net | $ (19) | $ 149
Energy related derivative [Member] | Natural gas [Member] | Fixed-Price Swap [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] | Utica Shale [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 170 |
Energy related derivative [Member] | Natural gas [Member] | Three Way Collar [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 88 | 0
Derivative assets (liabilities), at fair value, net | $ 3 | $ 0
Energy related derivative [Member] | Natural gas [Member] | Collar [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 66 | 47
Derivative assets (liabilities), at fair value, net | $ 0 | $ 11
Energy related derivative [Member] | Natural gas [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 60 | 110
Derivative assets (liabilities), at fair value, net | $ 0 | $ (3)
Energy related derivative [Member] | Natural gas [Member] | Basis Protection Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 44 | 65
Derivative assets (liabilities), at fair value, net | $ (7) | $ (7)
Energy related derivative [Member] | NGL [Member] | Fixed-Price Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | gal | 57 | 33
Derivative assets (liabilities), at fair value, net | $ (15) | $ (2)

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