Pension and Postretirement Benefits	6 Months Ended
	Jun. 30, 2021
Retirement Benefits [Abstract]
Pension and Postretirement Benefits	Pension and Postretirement BenefitsPension Plans. EOG has a defined contribution pension plan in place for most of its employees in the United States. EOG's contributions to the pension plan are based on various percentages of compensation and, in some instances, are based upon the amount of the employees' contributions. EOG's total costs recognized for the pension plan were $25 million and $21 million for the six months ended June 30, 2021 and 2020, respectively. In addition, EOG's Trinidadian subsidiary maintains a contributory defined benefit pension plan and a matched savings plan, both of which are available to most of its employees of the Trinidadian subsidiary, the costs of which are not material.Postretirement Health Care. EOG has postretirement medical and dental benefits in place for eligible United States and Trinidad employees and their eligible dependents, the costs of which are not material.