Long-Term Debt	9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]
Long-Term Debt [Text Block]	Long-Term Debt During the nine months ended September 30, 2016 and 2015, EOG utilized commercial paper borrowings bearing market interest rates, for various corporate financing purposes. At September 30, 2016 and 2015, EOG had zero and $30 million, respectively, of outstanding commercial paper borrowings and no uncommitted credit facility borrowings. The average borrowings outstanding under the commercial paper program were $155 million and $7 million during the nine months ended September 30, 2016 and 2015, respectively. The weighted average interest rates for commercial paper borrowings during the nine months ended September 30, 2016 and 2015 was 0.76% and 0.45%, respectively. At September 30, 2016, $600 million aggregate principal amount of EOG's 5.875% Senior Notes due 2017 were reclassified as long-term debt based upon its intent and ability to ultimately replace such amount with other long-term debt. On February 1, 2016, EOG repaid upon maturity the $400 million aggregate principal amount of its 2.500% Senior Notes due 2016 (2016 Notes). On January 14, 2016, EOG closed its sale of $750 million aggregate principal amount of its 4.15% Senior Notes due 2026 and $250 million aggregate principal amount of its 5.10% Senior Notes due 2036 (collectively, the Notes). Interest on the Notes is payable semi-annually in arrears on January 15 and July 15 of each year beginning on July 15, 2016. Net proceeds from the Notes offering totaled approximately $991 million and were used to repay the 2016 Notes when they matured on February 1, 2016, and for general corporate purposes, including repayment of outstanding commercial paper borrowings and funding of capital expenditures. EOG currently has a $2.0 billion senior unsecured Revolving Credit Agreement (Agreement) with domestic and foreign lenders. The Agreement has a scheduled maturity date of July 21, 2020, and includes an option for EOG to extend, on up to two occasions, the term for successive one-year periods subject to certain terms and conditions. Advances under the Agreement will 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 September 30, 2016, there were no borrowings or letters of credit outstanding under the Agreement. The Eurodollar rate and applicable base rate, had there been any amounts borrowed under the Agreement, would have been 1.53% and 3.50%, respectively.

Long-Term Debt

During the nine months ended September 30, 2016 and 2015, EOG utilized commercial paper borrowings bearing market interest rates, for various corporate financing purposes. At September 30, 2016 and 2015, EOG had zero and $30 million, respectively, of outstanding commercial paper borrowings and no uncommitted credit facility borrowings. The average borrowings outstanding under the commercial paper program were $155 million and $7 million during the nine months ended September 30, 2016 and 2015, respectively. The weighted average interest rates for commercial paper borrowings during the nine months ended September 30, 2016 and 2015 was 0.76% and 0.45%, respectively.

At September 30, 2016, $600 million aggregate principal amount of EOG's 5.875% Senior Notes due 2017 were reclassified as long-term debt based upon its intent and ability to ultimately replace such amount with other long-term debt.

On February 1, 2016, EOG repaid upon maturity the $400 million aggregate principal amount of its 2.500% Senior Notes due 2016 (2016 Notes).

On January 14, 2016, EOG closed its sale of $750 million aggregate principal amount of its 4.15% Senior Notes due 2026 and $250 million aggregate principal amount of its 5.10% Senior Notes due 2036 (collectively, the Notes). Interest on the Notes is payable semi-annually in arrears on January 15 and July 15 of each year beginning on July 15, 2016. Net proceeds from the Notes offering totaled approximately $991 million and were used to repay the 2016 Notes when they matured on February 1, 2016, and for general corporate purposes, including repayment of outstanding commercial paper borrowings and funding of capital expenditures.

EOG currently has a $2.0 billion senior unsecured Revolving Credit Agreement (Agreement) with domestic and foreign lenders. The Agreement has a scheduled maturity date of July 21, 2020, and includes an option for EOG to extend, on up to two occasions, the term for successive one-year periods subject to certain terms and conditions. Advances under the Agreement will 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 September 30, 2016, there were no borrowings or letters of credit outstanding under the Agreement. The Eurodollar rate and applicable base rate, had there been any amounts borrowed under the Agreement, would have been 1.53% and 3.50%, respectively.