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Fair Value Measurements and Disclosures (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Measurement information for assets and liabilities that are measured at fair value on a recurring basis was as follows: 
 
Fair Value Measurements Using
 
 
 
 
(millions)
Quoted Prices in 
Active Markets
(Level 1) (1)
 
Significant Other
Observable Inputs
(Level 2) (2)
 
Significant
Unobservable
Inputs (Level 3) (3)
 
Adjustment (4)
 
Fair Value Measurement
September 30, 2018
 
 
 
 
 
 
 
 
 
Financial Assets:
 
 
 
 
 
 
 
 
 
Mutual Fund Investments
$
58

 
$
—

 
$
—

 
$
—

 
$
58

Commodity Derivative Instruments
—

 
35

 
—

 
(35
)
 
—

Investment in Tamar Petroleum Ltd. (38,495,575 Shares)
—

 
165

 
—

 
—

 
165

Financial Liabilities:
 
 
 
 
 
 
 
 
 
Commodity Derivative Instruments
—

 
(429
)
 
—

 
35

 
(394
)
Portion of Deferred Compensation Liability Measured at Fair Value
(73
)
 
—

 
—

 
—

 
(73
)
Stock Based Compensation Liability Measured at Fair Value
(14
)
 
—

 
—

 
—

 
(14
)
December 31, 2017
 
 
 
 
 
 
 
 
 
Financial Assets:
 
 
 
 
 
 
 
 
 
Mutual Fund Investments
$
57

 
$
—

 
$
—

 
$
—

 
$
57

Commodity Derivative Instruments
—

 
7

 
—

 
(5
)
 
2

Financial Liabilities:
 
 
 
 
 
 
 
 
 
Commodity Derivative Instruments
—

 
(78
)
 
—

 
5

 
(73
)
Portion of Deferred Compensation Liability Measured at Fair Value
(71
)
 
—

 
—

 
—

 
(71
)
Stock Based Compensation Liability Measured at Fair Value
(10
)
 
—

 
—

 
—

 
(10
)
(1) 
Level 1 measurements are fair value measurements which use quoted market prices (unadjusted) in active markets for identical assets or liabilities. We use Level 1 inputs when available as Level 1 inputs generally provide the most reliable evidence of fair value.
(2) 
Level 2 measurements are fair value measurements which use inputs, other than quoted prices included within Level 1, which are observable for the asset or liability, either directly or indirectly.
(3) 
Level 3 measurements are fair value measurements which use unobservable inputs.
(4) 
Amount represents the impact of netting provisions within our master agreements that allow us to net cash settle asset and liability positions with the same counterparty.
Investment in CNX Midstream Partners The fair value of the investment at December 31, 2017, was based on the published market price of the common units at that date. During second quarter 2018, we sold 7.5 million of our 21.7 million common units in CNX Midstream Partners. In third quarter 2018, we sold the remaining 14.2 million common units. See Note 3. Acquisitions and Divestitures.
 
September 30, 2018
 
December 31, 2017
(millions)
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Investment in CNX Midstream Partners (0 Common Units and 21,692,198 Common Units, respectively)
$
—

 
$
—

 
$
70

 
$
364
Additional fair value disclosures Fair value information regarding our debt is as follows:
 
September 30, 2018
 
December 31, 2017
(millions)
Carrying Amount
 
Fair Value(1)
 
Carrying Amount
 
Fair Value
Long-Term Debt (2)
$
6,442

 
$
6,498

 
$
6,586

 
$
7,142


(1) 
As of September 30, 2018, the fair value of long-term debt approximates the carrying amount, primarily due to the current rising interest rate environment.
(2) 
Excludes unamortized discount, premium, debt issuance costs and capital lease obligations.