Derivative and Hedging Activities - Fair Value Level 3 Measurements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ (35)
Balance, end of period	282	$ (35)
Energy related derivative [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(35)
Balance, end of period	282	(35)
Energy related derivative [Member] \| Future natural gas prices [Member] \| Utica Shale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	0
Balance, end of period	7	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(15)
Balance, end of period	94	(15)
Fair Value, Inputs, Level 3 [Member] \| Commodity contract [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(15)	(10)
Total gains (losses) (realized/unrealized): Included in earnings	77	2
Total purchases, issuances, sales and settlements: Settlements	25	(7)
Balance, end of period	87	(15)
Fair Value, Inputs, Level 3 [Member] \| Energy related derivative [Member] \| Future natural gas prices [Member] \| Utica Shale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	0	0
Total gains (losses) (realized/unrealized): Included in earnings	7	0
Total purchases, issuances, sales and settlements: Settlements	0	0
Balance, end of period	7	0
Oil, Natural Gas and NGL Sales [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commodity contract [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total gains (losses) (realized/unrealized): Included in earnings	77	2
Change in unrealized gains (losses) related to assets still held at reporting date	86	(14)
Oil, Natural Gas and NGL Sales [Member] \| Fair Value, Inputs, Level 3 [Member] \| Energy related derivative [Member] \| Future natural gas prices [Member] \| Utica Shale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total gains (losses) (realized/unrealized): 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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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- Definition

Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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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