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Derivative and Hedging Activities - Derivative Instruments (Details) bbl in Millions, Bcf in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) Bcf bbl | Dec. 31, 2019 USD ($) Bcf bbl
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ (166) | $ 130
Energy related derivative |  |
Derivative [Line Items] |  |
Derivative assets (liabilities), at fair value, net | $ (166) | $ 130
Energy related derivative | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | bbl | 26 | 34
Derivative assets (liabilities), at fair value, net | $ (5) | $ 5
Energy related derivative | Oil | Fixed-price swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | bbl | 26 | 24
Derivative assets (liabilities), at fair value, net | $ (5) | $ (7)
Energy related derivative | Oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | bbl | 0 | 2
Derivative assets (liabilities), at fair value, net | $ 0 | $ 14
Energy related derivative | Oil | Basis protection swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | bbl | 0 | 8
Derivative assets (liabilities), at fair value, net | $ 0 | $ (2)
Energy related derivative | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 780 | 346
Derivative assets (liabilities), at fair value, net | $ (161) | $ 125
Energy related derivative | Natural Gas | Fixed-price swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 780 | 265
Derivative assets (liabilities), at fair value, net | $ (161) | $ 125
Energy related derivative | Natural Gas | Call options (sold) |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 0 | 22
Derivative assets (liabilities), at fair value, net | $ 0 | $ 0
Energy related derivative | Natural Gas | Call swaptions |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 0 | 29
Derivative assets (liabilities), at fair value, net | $ 0 | $ (2)
Energy related derivative | Natural Gas | Basis protection swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume | Bcf | 0 | 30
Derivative assets (liabilities), at fair value, net | $ 0 | $ 2

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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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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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