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Impairments (Tables) | 9 Months Ended
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Sep. 30, 2018
Impairment Of Long Lived Assets [Abstract] |
Impairment charges by segment before tax. |
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 Ended |  | Nine Months Ended
September 30 | September 30
|  |  | 2018 |  | 2017 |  | 2018 |  | 2017
Alaska |  | $ | - |  | 1 |  | - |  | 178
Lower 48 |  |  | 44 |  | 3 |  | 55 |  | 3,888
Canada |  |  | - |  | - |  | - |  | 18
Europe and North Africa |  |  | - |  | 2 |  | (48) |  | 7
Asia Pacific and Middle East |  |  | - |  | - |  | 14 |  | 2,384
|  | $ | 44 |  | 6 |  | 21 |  | 6,475

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