Derivative and Hedging Activities - Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total derivatives	$ 130	$ 282
Energy related derivative
Derivatives, Fair Value [Line Items]
Total derivatives	130	282
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	130
Derivative liability, fair value, gross asset	0
Total derivatives	130
Not designated as hedging instrument \| Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability		282
Derivative liability, fair value, gross asset		0
Total derivatives		282
Short-term derivative asset \| Not designated as hedging instrument \| Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	174	306
Derivative asset, fair value, gross liability	(40)	(104)
Total derivatives	134	202
Long-term derivative asset \| Not designated as hedging instrument \| Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset		117
Derivative asset, fair value, gross liability		(41)
Total derivatives		76
Short-term derivative liability \| Not designated as hedging instrument \| Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(42)	(107)
Derivative liability, fair value, gross asset	40	104
Total derivatives	(2)	(3)
Long-term derivative liability \| Not designated as hedging instrument \| Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(2)	(41)
Derivative liability, fair value, gross asset	0	41
Total derivatives	$ (2)	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
Derivative asset, fair value, gross liability		0
Total derivatives		$ 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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