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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Assets and Liabilities Measured On Recurring Basis
The following table provides fair value measurement information within the fair value hierarchy for certain of EOG's financial assets and liabilities carried at fair value on a recurring basis at December 31, 2017 and 2016. Amounts shown in millions.
 
Fair Value Measurements Using:
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
At December 31, 2017
 
 
 
 
 
 
 
Financial Assets: (1)
 
 
 
 
 
 
 
Natural Gas Swaps
$
—

 
$
2

 
$
—

 
$
2

Natural Gas Options/Collars
—

 
6

 
—

 
6

Financial Liabilities: (2)
 
 
 
 
 
 
 
Crude Oil Swaps
$
—

 
$
38

 
$
—

 
$
38

Crude Oil Basis Swaps
—

 
19

 
—

 
19

At December 31, 2016
 

 
 

 
 

 
 

Financial Assets: (1)
 

 
 

 
 

 
 

Natural Gas Options/Collars
$
—

 
$
1

 
$
—

 
$
1

Financial Liabilities: (2)
 
 
 
 
 
 
 
Crude Oil Swaps
$
—

 
$
36

 
$
—

 
$
36

Natural Gas Swaps
—

 
4

 
—

 
4

Natural Gas Options/Collars
—

 
22

 
—

 
22


 
 
(1)
$8 million is included in "Assets from Price Risk Management Activities" at December 31, 2017, and $1 million is included in "Other Assets" at December 31, 2016, on the Consolidated Balance Sheets.
(2)
$50 million and $62 million is included in "Current Liabilities - Liabilities from Price Risk Management Activities" at December 31, 2017 and 2016, respectively, and $7 million is included in "Other Liabilities" at December 31, 2017, on the Consolidated Balance Sheets.