Derivative and Hedging Activities - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) day derivative $ / BTU	Mar. 31, 2019 USD ($) counterparty derivative
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 Iistrument, convertible, threshold trading days \| day	20
Debt instrument, convertible, threshold consecutive trading days \| day	30
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 \| $ / 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 \| $ / BTU	3.25

Number of Counterparties

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- Definition

The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph (b)
-Subparagraph (1)

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+ References

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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

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

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

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
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