Long-Term Debt (Notes)	9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt During the nine months ended September 30, 2017 and 2016, EOG utilized commercial paper borrowings, bearing market interest rates, for various corporate financing purposes. At September 30, 2017 and 2016, EOG had no outstanding commercial paper borrowings or uncommitted credit facility borrowings. The average borrowings outstanding under the commercial paper program were $9 million and $155 million during the nine months ended September 30, 2017 and 2016, respectively. The weighted average interest rates for commercial paper borrowings during the nine months ended September 30, 2017 and 2016 was 1.39% and 0.76%, respectively. On September 15, 2017, EOG repaid upon maturity the $600 million aggregate principal amount of its 5.875% Senior Notes due 2017. 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, 2017, 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 2.23% and 4.25%, respectively.

Long-Term Debt

During the nine months ended September 30, 2017 and 2016, EOG utilized commercial paper borrowings, bearing market interest rates, for various corporate financing purposes. At September 30, 2017 and 2016, EOG had no outstanding commercial paper borrowings or uncommitted credit facility borrowings. The average borrowings outstanding under the commercial paper program were $9 million and $155 million during the nine months ended September 30, 2017 and 2016, respectively. The weighted average interest rates for commercial paper borrowings during the nine months ended September 30, 2017 and 2016 was 1.39% and 0.76%, respectively.

On September 15, 2017, EOG repaid upon maturity the $600 million aggregate principal amount of its 5.875% Senior Notes due 2017.

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, 2017, 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 2.23% and 4.25%, respectively.