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Fair Value Measurements (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial Liabilities:      
Proved and unproved oil and gas properties and other assets, carrying amount $ 400,000,000 $ 1,524,000,000   
Proved and unproved oil and gas properties and other property, plant and equipment written down during the period - fair value at end of period 228,000,000 391,000,000   
Pretax impairment charges for proved oil and gas properties and other property, plant and equipment, in which EOG utilized an accepted offer from a third-party buyer 58,000,000 60,000,000   
Pretax impairment charges for proved oil and gas properties and other property, plant and equipment 172,000,000 1,133,000,000   
Aggregate Principal Amount of Current and Long-Term Debt 5,890,000,000 6,290,000,000  
Fair Value of Debt 6,222,000,000 7,032,000,000  
Recurring [Member]
     
Financial Assets:      
Financial Assets: Crude Oil Swaps   65,000,000  
Financial Assets: Crude Oil Options/Swaptions   36,000,000  
Financial Assets: Natural Gas Options/Swaptions 8,000,000 65,000,000  
Financial Liabilities:      
Financial Liabilities: Crude Oil Swaps 17,000,000    
Financial Liabilities: Crude Oil Options/Swaptions 110,000,000 8,000,000  
Financial Liabilities: Natural Gas Options/Swaptions   13,000,000  
Financial Liabilities: Foreign Currency Rate Swap 40,000,000 55,000,000  
Financial Liabilities: Interest Rate Swap 1,000,000 4,000,000  
Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Financial Assets:      
Financial Assets: Crude Oil Swaps   0  
Financial Assets: Crude Oil Options/Swaptions   0  
Financial Assets: Natural Gas Options/Swaptions 0 0  
Financial Liabilities:      
Financial Liabilities: Crude Oil Swaps 0    
Financial Liabilities: Crude Oil Options/Swaptions 0 0  
Financial Liabilities: Natural Gas Options/Swaptions   0  
Financial Liabilities: Foreign Currency Rate Swap 0 0  
Financial Liabilities: Interest Rate Swap 0 0  
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Financial Assets:      
Financial Assets: Crude Oil Swaps   65,000,000  
Financial Assets: Crude Oil Options/Swaptions   36,000,000  
Financial Assets: Natural Gas Options/Swaptions 8,000,000 65,000,000  
Financial Liabilities:      
Financial Liabilities: Crude Oil Swaps 17,000,000    
Financial Liabilities: Crude Oil Options/Swaptions 110,000,000 8,000,000  
Financial Liabilities: Natural Gas Options/Swaptions   13,000,000  
Financial Liabilities: Foreign Currency Rate Swap 40,000,000 55,000,000  
Financial Liabilities: Interest Rate Swap 1,000,000 4,000,000  
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Financial Assets:      
Financial Assets: Crude Oil Swaps   0  
Financial Assets: Crude Oil Options/Swaptions   0  
Financial Assets: Natural Gas Options/Swaptions 0 0  
Financial Liabilities:      
Financial Liabilities: Crude Oil Swaps 0    
Financial Liabilities: Crude Oil Options/Swaptions 0 0  
Financial Liabilities: Natural Gas Options/Swaptions   0  
Financial Liabilities: Foreign Currency Rate Swap 0 0  
Financial Liabilities: Interest Rate Swap $ 0 $ 0