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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021 and December 31, 2020 (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 March 31, 2021    
Financial Assets:    
Natural Gas Swaps$— $23 $— $23 
Financial Liabilities:
Natural Gas Swaps— 5 — 5 
Crude Oil Swaps— 175 — 175 
Crude Oil Roll Differential Swaps— 20 — 20 
Natural Gas Liquids Swaps— 18 — 18 
At December 31, 2020
Financial Assets:
Natural Gas Swaps$— $66 $— $66 
Financial Liabilities:
Crude Oil Roll Differential Swaps— 1 — 1