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Impairments
 9 Months Ended
Sep. 30, 2018
Impairment Of Long Lived Assets [Abstract]  
Impairments
Note 9—Impairments
During the three- and nine-month periods ended September 30, 2018 and 2017, we recognized before-tax impairment charges within the following segments:
Millions of Dollars
Three Months EndedNine Months Ended
September 30September 30
2018201720182017
Alaska$-1-178
Lower 48 443553,888
Canada ---18
Europe and North Africa -2(48)7
Asia Pacific and Middle East --142,384
$446216,475

In the three-month period ended September 30, 2018, impairments in our Lower 48 segment were primarily

related to developed properties in our Barnett asset which were written down to fair value less costs to sell.

In the nine-month period ended September 30, 2018, our Lower 48 segment included before-tax impairments of $55 million, primarily related to developed properties in our Barnett asset which were written down to fair value less costs to sell, partly offset by a revision to reflect finalized proceeds on a separate transaction. In our Europe and North Africa segment, we recorded a credit to impairment of $49 million, primarily due to decreased ARO estimates on a certain field in the United Kingdom that has ceased production and was impaired in a prior year.

For additional information related to the status of our Barnett asset, see Note 5—Assets Held for Sale, Dispositions, Acquisitions and Other Planned Transactions.

In the nine-month period ended September 30, 2017, our Lower 48 segment included before-tax impairments of $3.3 billion for our interests in the San Juan Basin and $0.6 billion for our interests in the Barnett asset, which were written down to fair value less costs to sell. See the “APLNG” section of Note 6—Investments, Loans and Long-Term Receivables, for information on the impairment of our APLNG investment included within the Asia Pacific and Middle East segment. Additionally, our Alaska segment included an impairment of $174 million for the associated carrying value of our small interest in the Point Thomson Unit.

The charge discussed below is included in the “Exploration expenses” line on our consolidated income statement and is not reflected in the table above.

In the nine-month period ended September 30, 2017, we recorded a before-tax impairment of $51 million in our Lower 48 segment for the associated carrying value of capitalized undeveloped leasehold costs of Shenandoah in deepwater Gulf of Mexico following the suspension of appraisal activity by the operator.