Accounting For Certain Long-Lived Assets	12 Months Ended
Dec. 31, 2014
Accounting For Certain Long-Lived Assets [Abstract]
Accounting For Certain Long-Lived Assets	14. Accounting for Certain Long-Lived Assets EOG reviews its proved oil and gas properties for impairment purposes by comparing the expected undiscounted future cash flows at a depreciation, depletion and amortization group level to the unamortized capitalized cost of the asset. During 2014, 2013 and 2012, such reviews indicated that unamortized capitalized costs of certain properties were higher than their expected undiscounted future cash flows primarily due to lower commodity prices, downward reserve revisions, drilling of marginal or uneconomic wells, or development dry holes in certain producing fields. Several impairments over this period were recognized in connection with the signing of purchase and sale agreements. As a result, EOG recorded pretax charges of $171 million, $73 million and $171 million in the United States during 2014, 2013 and 2012, respectively, and $8 million, $76 million and $872 million in Canada during 2014, 2013 and 2012, respectively. Additionally, EOG recorded pretax charges of $396 million and $9 million in Other International during 2014 and 2013, respectively, and $14 million in Trinidad during 2013. The pretax charges are included in Impairments on the Consolidated Statements of Income and Comprehensive Income. The carrying values for assets determined to be impaired were adjusted to estimated fair value using the Income Approach described in the Fair Value Measurement Topic of the ASC. In certain instances, EOG utilizes accepted bids as the basis for determining fair value. Amortization and impairments of unproved oil and gas property costs, including amortization of capitalized interest, were $168 million, $115 million and $228 million during 2014, 2013 and 2012, respectively.

14. Accounting for Certain Long-Lived Assets

EOG reviews its proved oil and gas properties for impairment purposes by comparing the expected undiscounted future cash flows at a depreciation, depletion and amortization group level to the unamortized capitalized cost of the asset. During 2014, 2013 and 2012, such reviews indicated that unamortized capitalized costs of certain properties were higher than their expected undiscounted future cash flows primarily due to lower commodity prices, downward reserve revisions, drilling of marginal or uneconomic wells, or development dry holes in certain producing fields. Several impairments over this period were recognized in connection with the signing of purchase and sale agreements. As a result, EOG recorded pretax charges of $171 million, $73 million and $171 million in the United States during 2014, 2013 and 2012, respectively, and $8 million, $76 million and $872 million in Canada during 2014, 2013 and 2012, respectively. Additionally, EOG recorded pretax charges of $396 million and $9 million in Other International during 2014 and 2013, respectively, and $14 million in Trinidad during 2013. The pretax charges are included in Impairments on the Consolidated Statements of Income and Comprehensive Income. The carrying values for assets determined to be impaired were adjusted to estimated fair value using the Income Approach described in the Fair Value Measurement Topic of the ASC. In certain instances, EOG utilizes accepted bids as the basis for determining fair value. Amortization and impairments of unproved oil and gas property costs, including amortization of capitalized interest, were $168 million, $115 million and $228 million during 2014, 2013 and 2012, respectively.