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Derivative and Hedging Activities - Derivative Instruments (Details) MMBbls in Millions, $ in Millions, Bcf in Trillions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) Bcf MMBbls | Dec. 31, 2018 USD ($) Bcf MMBbls
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ 262 | $ 282
Energy related derivative |  |
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | 262 | 282
Energy related derivative | Future Natural Gas Prices | Utica Shale |  |
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ 0 | $ 7
Energy related derivative | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 37 | 27
Derivative assets (liabilities), at fair value, net | $ 87 | $ 260
Energy related derivative | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 697 | 966
Derivative assets (liabilities), at fair value, net | $ 175 | $ 15
Energy related derivative | Fixed-price swaps | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 24 | 12
Derivative assets (liabilities), at fair value, net | $ 64 | $ 157
Energy related derivative | Fixed-price swaps | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 505 | 623
Derivative assets (liabilities), at fair value, net | $ 176 | $ 26
Energy related derivative | Three-way collars | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 15 | 88
Derivative assets (liabilities), at fair value, net | $ 2 | $ 1
Energy related derivative | Collars | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 5 | 8
Derivative assets (liabilities), at fair value, net | $ 27 | $ 98
Energy related derivative | Collars | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 18 | 55
Derivative assets (liabilities), at fair value, net | $ 7 | $ (3)
Energy related derivative | Call options | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 33 | 44
Derivative assets (liabilities), at fair value, net | $ 0 | $ 0
Energy related derivative | Call swaptions | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 2 |
Derivative assets (liabilities), at fair value, net | $ (5) |
Energy related derivative | Call swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 106 | 106
Derivative assets (liabilities), at fair value, net | $ (10) | $ (9)
Energy related derivative | Put options | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 2 |
Derivative assets (liabilities), at fair value, net | $ (5) |
Energy related derivative | Basis protection swaps | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | MMBbls | 4 | 7
Derivative assets (liabilities), at fair value, net | $ 6 | $ 5
Energy related derivative | Basis protection swaps | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 20 | 50
Derivative assets (liabilities), at fair value, net | $ 0 | $ 0

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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