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Impairments (Tables)

9 Months Ended

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