Derivative and Hedging Activities - Derivative Instruments in Balance Sheet Table (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), at fair value, net	$ 323	$ 282
Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset	347	422
Derivative liability	(24)	(147)
Energy related derivative
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), at fair value, net	323	282
Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset (liability), fair value, gross asset (liability)	323	282
Derivative asset (liability) fair value, net asset (liability), netted	0	0
Derivative assets (liabilities), at fair value, net	323	282
Short-term derivative asset \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	294	306
Derivative asset, fair value, gross liability, netted	(22)	(104)
Derivative asset	272	202
Long-term derivative asset \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	55	117
Derivative asset, fair value, gross liability, netted	(4)	(41)
Derivative asset	51	76
Short-term derivative liability \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(22)	(107)
Derivative liability, fair value, gross asset, netted	22	104
Derivative liability	0	(3)
Long-term derivative liability \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(4)	(41)
Derivative liability, fair value, gross asset, netted	4	41
Derivative liability	0	0
Future Natural Gas Prices \| Short-term derivative asset \| Not designated as hedging instrument \| Energy related derivative
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	0	7
Derivative asset, fair value, gross liability, netted	0	0
Derivative asset	$ 0	$ 7

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 value, after the 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 not subject to a master netting arrangement and not elected to be offset.

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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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