Derivative and Hedging Activities - Fair Value Level 3 Measurements (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Derivative assets (liabilities), at fair value, net, beginning of period	$ 130
Derivative assets (liabilities), at fair value, net, end of period	862
Energy related derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Derivative assets (liabilities), at fair value, net, beginning of period	130
Derivative assets (liabilities), at fair value, net, end of period	862
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Derivative assets (liabilities), at fair value, net, beginning of period	12
Derivative assets (liabilities), at fair value, net, end of period	31
Significant Unobservable Inputs (Level 3) \| Commodity contract
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Derivative assets (liabilities), at fair value, net, beginning of period	12	$ 87
Gains (loses) included in earnings	28	(88)
Settlements	(9)	4
Derivative assets (liabilities), at fair value, net, end of period	31	3
Significant Unobservable Inputs (Level 3) \| Commodity contract \| Oil, natural gas and NGL sales
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Gains (loses) included in earnings	28	(88)
Change in unrealized gains (losses) related to assets still held at reporting date	19	(84)
Significant Unobservable Inputs (Level 3) \| Future Natural Gas Prices \| Utica Shale \| Energy related derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Derivative assets (liabilities), at fair value, net, beginning of period	0	7
Gains (loses) included in earnings	0	0
Settlements	0	0
Derivative assets (liabilities), at fair value, net, end of period	$ 0	$ 7

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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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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