Derivative and Hedging Activities - Derivative Instruments in Balance Sheet Table (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (3)	$ 282
Energy related derivative
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(3)	282
Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(3)	282
Derivative liability, fair value, gross asset	0	0
Derivative, fair value, net	(3)	282
Short-term derivative asset \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	69	306
Derivative asset, fair value, gross liability	(51)	(104)
Derivative, fair value, net	18	202
Long-term derivative asset \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	61	117
Derivative asset, fair value, gross liability	(13)	(41)
Derivative, fair value, net	48	76
Short-term derivative liability \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(112)	(107)
Derivative liability, fair value, gross asset	51	104
Derivative, fair value, net	(61)	(3)
Long-term derivative liability \| Not designated as hedging instrument \| Commodity contract
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(28)	(41)
Derivative liability, fair value, gross asset	13	41
Derivative, fair value, net	(15)	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	7	7
Derivative asset, fair value, gross liability	0	0
Derivative, fair value, net	$ 7	$ 7

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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