Long-Term Debt	3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt [Text Block]	10. Long-Term Debt EOG had no outstanding commercial paper borrowings or uncommitted credit facility borrowings at March 31, 2015 and did not utilize any such borrowings during the three months ended March 31, 2015. During the three months ended March 31, 2014, EOG utilized commercial paper and short-term borrowings under uncommitted credit facilities, bearing market interest rates, for various corporate financing purposes. The average borrowings outstanding under the commercial paper program and under uncommitted credit facilities were $31 million and $0.3 million, respectively, during the three months ended March 31, 2014. The weighted average interest rates for commercial paper borrowings and uncommitted credit facility borrowings were 0.25% and 0.70%, respectively, during the three months ended March 31, 2014. At March 31, 2015, $400 million aggregate principal amount of 2.500% Senior Notes due 2016 were classified as long-term debt based upon EOG's intent and ability to ultimately replace such amount with other long-term debt. On March 17, 2015, EOG closed its sale of $500 million aggregate principal amount of its 3.15% Senior Notes due 2025 and $500 million aggregate principal amount of its 3.90% Senior Notes due 2035 (together, the Notes). Interest on the Notes is payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2015. Net proceeds from the Notes offering of approximately $990 million were used for general corporate purposes. EOG currently has a $2.0 billion senior unsecured Revolving Credit Agreement (Agreement) with domestic and foreign lenders. The Agreement matures on October 11, 2016, and includes an option for EOG to extend, on up to two occasions, the term for successive one-year periods, subject to, among certain other terms and conditions, the consent of the banks holding greater than 50% of the commitments then outstanding under the Agreement. At March 31, 2015, there were no borrowings or letters of credit outstanding under the Agreement. Advances under the Agreement accrue interest based, at EOG's option, on either the London InterBank Offered Rate plus an applicable margin (Eurodollar rate), or the base rate (as defined in the Agreement) plus an applicable margin. At March 31, 2015, the Eurodollar rate and applicable base rate, had there been any amounts borrowed under the Agreement, would have been 1.05% and 3.25%, respectively.

10. Long-Term Debt

EOG had no outstanding commercial paper borrowings or uncommitted credit facility borrowings at March 31, 2015 and did not utilize any such borrowings during the three months ended March 31, 2015. During the three months ended March 31, 2014, EOG utilized commercial paper and short-term borrowings under uncommitted credit facilities, bearing market interest rates, for various corporate financing purposes. The average borrowings outstanding under the commercial paper program and under uncommitted credit facilities were $31 million and $0.3 million, respectively, during the three months ended March 31, 2014. The weighted average interest rates for commercial paper borrowings and uncommitted credit facility borrowings were 0.25% and 0.70%, respectively, during the three months ended March 31, 2014.

At March 31, 2015, $400 million aggregate principal amount of 2.500% Senior Notes due 2016 were classified as long-term debt based upon EOG's intent and ability to ultimately replace such amount with other long-term debt.

On March 17, 2015, EOG closed its sale of $500 million aggregate principal amount of its 3.15% Senior Notes due 2025 and $500 million aggregate principal amount of its 3.90% Senior Notes due 2035 (together, the Notes). Interest on the Notes is payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2015. Net proceeds from the Notes offering of approximately $990 million were used for general corporate purposes.

EOG currently has a $2.0 billion senior unsecured Revolving Credit Agreement (Agreement) with domestic and foreign lenders. The Agreement matures on October 11, 2016, and includes an option for EOG to extend, on up to two occasions, the term for successive one-year periods, subject to, among certain other terms and conditions, the consent of the banks holding greater than 50% of the commitments then outstanding under the Agreement. At March 31, 2015, there were no borrowings or letters of credit outstanding under the Agreement. Advances under the Agreement accrue interest based, at EOG's option, on either the London InterBank Offered Rate plus an applicable margin (Eurodollar rate), or the base rate (as defined in the Agreement) plus an applicable margin. At March 31, 2015, the Eurodollar rate and applicable base rate, had there been any amounts borrowed under the Agreement, would have been 1.05% and 3.25%, respectively.