Derivative and Hedging Activities - Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total derivatives	$ 282	$ (35)
Energy related derivative [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	282	(35)
Not designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	282
Derivative liability, fair value, gross asset	0
Total derivatives	282
Not designated as hedging instrument [Member] \| Commodity contract [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability		(35)
Derivative liability, fair value, gross asset		0
Total derivatives		(35)
Other current assets [Member] \| Not designated as hedging instrument [Member] \| Commodity contract [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	306	157
Derivative asset, fair value, gross liability	(104)	(130)
Total derivatives	202	27
Other noncurrent assets [Member] \| Not designated as hedging instrument [Member] \| Commodity contract [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	117
Derivative asset, fair value, gross liability	(41)
Total derivatives	76
Other current liabilities [Member] \| Not designated as hedging instrument [Member] \| Commodity contract [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(107)	(188)
Derivative liability, fair value, gross asset	104	130
Total derivatives	(3)	(58)
Other noncurrent liabilities [Member] \| Not designated as hedging instrument [Member] \| Commodity contract [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(41)	(4)
Derivative liability, fair value, gross asset	41	0
Total derivatives	0	$ (4)
Future natural gas prices [Member] \| Other current assets [Member] \| Not designated as hedging instrument [Member] \| Energy related derivative [Member]
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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