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Fair Value Measurements and Disclosures (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Measurement information for assets and liabilities measured at fair value on a recurring basis is as follows: 
 
Fair Value Measurements Using
 
 
 
 
(millions)
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
Adjustment (1)
 
Fair Value Measurement
March 31, 2019
 
 
 
 
 
 
 
 
 
Financial Assets:
 
 
 
 
 
 
 
 
 
Mutual Fund Investments
$
41

 
$
—

 
$
—

 
$
—

 
$
41

Commodity Derivative Instruments
—

 
23

 
—

 
(13
)
 
10

Financial Liabilities:
 
 
 
 
 
 
 
 
 
Commodity Derivative Instruments
—

 
(96
)
 
—

 
13

 
(83
)
Portion of Deferred Compensation Liability Measured at Fair Value
(48
)
 
—

 
—

 
—

 
(48
)
Stock Based Compensation Liability Measured at Fair Value
(1
)
 
—

 
—

 
—

 
(1
)
December 31, 2018
 
 
 
 
 
 
 
 
 
Financial Assets:
 
 
 
 
 
 
 
 
 
Mutual Fund Investments
$
38

 
$
—

 
$
—

 
$
—

 
$
38

Commodity Derivative Instruments
—

 
187

 
—

 
(7
)
 
180

Financial Liabilities:
 
 
 
 
 
 
 
 
 
Commodity Derivative Instruments
—

 
(34
)
 
—

 
7

 
(27
)
Portion of Deferred Compensation Liability Measured at Fair Value
(43
)
 
—

 
—

 
—

 
(43
)
Stock Based Compensation Liability Measured at Fair Value
(8
)
 
—

 
—

 
—

 
(8
)

(1) 
Amount represents the impact of netting provisions within our master agreements allowing us to net cash settled asset and liability positions with the same counterparty.
Additional fair value disclosures Fair value information regarding our debt is as follows:
 
March 31, 2019
 
December 31, 2018
(millions)
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Long-Term Debt (1)
$
6,622

 
$
6,841

 
$
6,452

 
$
6,121


(1) 
Excludes unamortized discount, debt issuance costs and finance lease obligations. See Note 8. Leases.