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Fair Value Measurements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract]    
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets Carrying Amount $ 258,000  
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets Written Down During the Period - Fair value at End of Period 93,000  
Pretax Impairment Charges for Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets 165,000  
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Assets, in which EOG utilized an accepted offer from a third-party purchaser 138,000  
Pretax Impairment Charge for a Commodity Price-Related Write-Down of Other Assets 23,000  
Debt Disclosure [Abstract]    
Aggregate Principal Amount of Current and Long-Term Debt 6,390,000 $ 6,990,000
Estimated Fair Value of Debt 6,620,000 7,190,000
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member]    
Financial Assets: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure   36
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Assets: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure   36
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial Assets: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 5  
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 0  
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 5  
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 0  
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 1  
Financial and Nonfinancial Liabilities, Fair Value Disclosure   4
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 0  
Financial and Nonfinancial Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 1  
Financial and Nonfinancial Liabilities, Fair Value Disclosure   4
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 0  
Financial and Nonfinancial Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 3 1
Financial and Nonfinancial Liabilities, Fair Value Disclosure   22
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure 3 1
Financial and Nonfinancial Liabilities, Fair Value Disclosure   22
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial Assets: [Abstract]    
Assets, Fair Value Disclosure $ 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure   $ 0