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Fair Value Measurements and Disclosures (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2018
 
 
 
 
 
 
 
 
 
Financial Assets
 
 
 
 
 
 
 
 
 
Mutual Fund Investments
$
56

 
$
—

 
$
—

 
$
—

 
$
56

Commodity Derivative Instruments
—

 
29

 
—

 
(19
)
 
10

Investment in Tamar Petroleum Ltd.
—

 
162

 
—

 
—

 
162

Financial Liabilities
 
 
 
 
 
 
 
 
 
Commodity Derivative Instruments
—

 
(151
)
 
—

 
19

 
(132
)
Portion of Deferred Compensation Liability Measured at Fair Value
(70
)
 
—

 
—

 
—

 
(70
)
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 is based on the published market price of the units for the date indicated below.
 
March 31, 2018
 
December 31, 2017
(millions)
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Investment in CNX Midstream Partners (21,692,198 Units)
$
72

 
$
399

 
$
70

 
$
364
Additional fair value disclosures Fair value information regarding our debt is as follows:
 
March 31, 2018
 
December 31, 2017
(millions)
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Long-Term Debt (1)
$
6,706

 
$
7,096

 
$
6,586

 
$
7,142

(1) 
Excludes unamortized discount, premium, debt issuance costs and capital lease obligations.