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Revolving Credit Facilities (Details)	1 Months Ended	6 Months Ended
	Apr. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 30, 2018 USD ($)
Short-term Debt [Line Items]
Number of days outstanding, prior to springing maturity date		91 days
Value of proved reserves, percentage to mortgage		80.00%
Value of proved developing producing reserves, percentage to mortgage		80.00%
Revolving Credit Facility
Short-term Debt [Line Items]
Debt instrument, face amount	$ 2,100,000,000	$ 160,000
Accordion feature, increased commitment	3,000,000,000
Initial borrowing base	$ 2,100,000,000
Letters of credit aggregate sub-limit					$ 650,000,000
Net leverage ratio	3.00
Percentage of aggregate commitments available under credit facility	15.00%
Minimum threshold to activate springing maturity date		$ 500,000,000
Minimum current ratio		1.00
Borrowings outstanding		$ 630,000,000	$ 612,000,000
Letters of credit outstanding		198,581,000	198,396,000
Borrowings and issuance of letters of credit remaining capacity		$ 1,271,419,000	1,289,604,000
Maximum | Revolving Credit Facility
Short-term Debt [Line Items]
Net leverage ratio		4.00
5.875% Senior Notes due 2022
Short-term Debt [Line Items]
Stated rate, debt instrument		5.875%
CNXM | Revolving Credit Facility
Short-term Debt [Line Items]
Letters of credit aggregate sub-limit					$ 600,000,000	$ 250,000,000
Borrowings outstanding		$ 208,000,000	$ 84,000,000
Borrowings and issuance of letters of credit remaining capacity		$ 392,000,000
Secured leverage ratio		3.00
Total leverage ratio		4.00
Pro forma availability of commitments, percentage		20.00%
Basket for repurchase of LP units tied to Available Cash, annual limit		$ 150,000
Basket for repurchase of LP units tied to Available Cash, lifetime limit		200,000
Maximum borrowing capacity, letters of credit		$ 100,000,000
Interest coverage ratio		2.50
CNXM | Minimum | Revolving Credit Facility
Short-term Debt [Line Items]
Maximum net leverage ratio		5.25
Total leverage ratio		4.75
CNXM | Maximum | Revolving Credit Facility
Short-term Debt [Line Items]
Maximum net leverage ratio		5.50
Secured leverage ratio		3.50
Total leverage ratio		5.25
CNXM | 5.875% Senior Notes due 2022 | Minimum
Short-term Debt [Line Items]
Debt instrument, face amount				$ 150,000,000
CNXM | 5.875% Senior Notes due 2022 | Maximum
Short-term Debt [Line Items]
Debt instrument, face amount				$ 150,000,000
Federal Funds Open Rate
Short-term Debt [Line Items]
Basis spread on variable rate		0.50%
Federal Funds Open Rate | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate		0.50%
One-Month LIBOR
Short-term Debt [Line Items]
Basis spread on variable rate		1.00%
One-Month LIBOR | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate		0.25%
One-Month LIBOR | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate		1.25%
One-Month LIBOR | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate		1.00%
One-Month LIBOR | CNXM | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate		0.50%
One-Month LIBOR | CNXM | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate		1.50%
London Interbank Offered Rate (LIBOR) | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate		1.25%
London Interbank Offered Rate (LIBOR) | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate		2.25%
London Interbank Offered Rate (LIBOR) | CNXM | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate		1.50%
London Interbank Offered Rate (LIBOR) | CNXM | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate		2.50%

X

- Definition

Credit Facility, Debt Covenant, Secured Leverage Ratio

+ References

No definition available.

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- Definition

Credit Facility, Debt Covenant, Total Leverage Ratio

+ References

No definition available.

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- Definition

Debt Instrument, Borrowing Base

+ References

No definition available.

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X

- Definition

Debt Instrument, Interest Coverage Ratio

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- Definition

Debt Instrument, Minimum Threshold to Activate Springing Maturity Date

+ References

No definition available.

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- Definition

Debt Instrument, Net Leverage Ratio

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X

- Definition

Letters Of Credit, Amount Outstanding

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No definition available.

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- Definition

Letters Of Credit, Maximum Borrowing Capacity

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X

- Definition

Line Of Credit Facility, Availability Under Credit Facility, Percentage Of Aggregate Commitments

+ References

No definition available.

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- Definition

Line Of Credit Facility, Basket Of Repurchase, Annual Limit Of Available Cash

+ References

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X

- Definition

Line Of Credit Facility, Basket Of Repurchase, Lifetime Limit Of Available Cash

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X

- Definition

Line Of Credit Facility, Pro Forma Availability Of Commitments, As A Percent

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X

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

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X

- Definition

Maximum Interest Ratio per Credit Facility Covenant

+ References

No definition available.

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X

- Definition

minimum current ratio per credit facility

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X

- Definition

Number Of Days Outstanding, Prior To Springing Maturity Date, Debt Securities

+ References

No definition available.

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X

- Definition

Percentage to Mortgage, Value of Proved Developed Producing Reserves

+ References

No definition available.

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- Definition

Percentage to Mortgage, Value of Proved Reserves

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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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.

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