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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

X

- 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

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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

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

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