Derivative and Hedging Activities - Fair Value Level 3 Measurements (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Derivative assets (liabilities), at fair value, net, beginning of period	$ 282
Derivative assets (liabilities), at fair value, net, end of period	323
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	282
Derivative assets (liabilities), at fair value, net, end of period	323
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	7
Derivative assets (liabilities), at fair value, net, end of period	0
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	94
Derivative assets (liabilities), at fair value, net, end of period	32
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	87	$ (15)
Gains (loses) included in earnings	(47)	(3)
Settlements	(8)	13
Derivative assets (liabilities), at fair value, net, end of period	32	(5)
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	(47)	(3)
Change in unrealized gains (losses) related to assets still held at reporting date	(57)	(3)
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	7	0
Gains (loses) included in earnings	(7)	0
Settlements	0	0
Derivative assets (liabilities), at fair value, net, end of period	0	0
Significant Unobservable Inputs (Level 3) \| Future Natural Gas Prices \| Utica Shale \| Energy related derivative \| Oil, natural gas and NGL sales
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Gains (loses) included in earnings	(7)	0
Change in unrealized gains (losses) related to assets still held at reporting date	$ (7)	$ 0

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 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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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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