Derivative and Hedging Activities - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2019 USD ($) counterparty derivative	Dec. 31, 2018 USD ($) day derivative $ / BTU
Derivative [Line Items]
Expected amount to be transferred of during the next 12 months	$ 34
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, number of instruments held \| derivative	0	0
Credit Risk
Derivative [Line Items]
Number of counterparties in hedge facility \| counterparty	15
Disposal group, disposed of by sale, not discontinued operations \| Utica Shale \| Future Natural Gas Prices
Derivative [Line Items]
Disposal group, including discontinued operation, consideration		$ 100
Debt instrument, convertible, threshold trading days \| day		20
Debt instrument, convertible, threshold consecutive trading days \| day		30
Unrealized gain (loss)	$ (7)
2022 NYMEX Natural Gas \| Disposal group, disposed of by sale, not discontinued operations \| Utica Shale \| Future Natural Gas Prices
Derivative [Line Items]
Disposal group, including discontinued operation, consideration		$ 50
2022 NYMEX Natural Gas \| Disposal group, disposed of by sale, not discontinued operations \| Utica Shale \| Future Natural Gas Prices 2022
Derivative [Line Items]
Average sales prices (in dollars per mmbtu) \| $ / BTU		3.00
2022 NYMEX Natural Gas \| Disposal group, disposed of by sale, not discontinued operations \| Utica Shale \| Future Natural Gas Prices 2023
Derivative [Line Items]
Average sales prices (in dollars per mmbtu) \| $ / BTU		3.25

Disposal Group, Including Discontinued Operations, Unrealized Gain (Loss) On Contingent Consideration Receivable

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- Definition

Number of Counterparties

+ References

No definition available.

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- Definition

Sales price per unit of oil and gas produced.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph (b)
-Subparagraph (1)

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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- Definition

The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 30
-Section 50
-Paragraph 1
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