Derivative and Hedging Activities - Derivative Instruments in Balance Sheet Table (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), at fair value, net	$ (166)	$ 130
Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset	14	174
Derivative liability	(180)	(44)
Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset (liability), fair value, gross asset (liability)	(166)	130
Derivative asset (liability) fair value, net asset (liability), netted	0	0
Derivative assets (liabilities), at fair value, net	(166)	130
Not designated as hedging instrument \| Commodity contract \| Short-term derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	12	174
Derivative asset, fair value, gross liability, netted	(12)	(40)
Derivative asset	0	134
Not designated as hedging instrument \| Commodity contract \| Long-term derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	4
Derivative asset, fair value, gross liability, netted	(4)
Derivative asset	0
Not designated as hedging instrument \| Commodity contract \| Short-term derivative liability
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(117)	(42)
Derivative liability, fair value, gross asset, netted	12	40
Derivative liability	(105)	(2)
Not designated as hedging instrument \| Commodity contract \| Long-term derivative liability
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(65)	(2)
Derivative liability, fair value, gross asset, netted	4	0
Derivative liability	$ (61)	$ (2)

Derivative Asset (Liability), Fair Value, Gross Asset (Liability)

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Derivative, Fair Value, Gross Asset (Liability)

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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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.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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.

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