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Impairments - Before Tax Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Impairments		$ (12)	$ 674	$ 813
Alaska | Operating Segments
Segment Reporting Information [Line Items]
Impairments		2	5	0
Lower 48
Segment Reporting Information [Line Items]
Impairments			(89)
Lower 48 | Operating Segments
Segment Reporting Information [Line Items]
Impairments	$ 84	(11)	(8)	804
Canada | Operating Segments
Segment Reporting Information [Line Items]
Impairments		(2)	6	3
Europe, Middle East and North Africa | Operating Segments
Segment Reporting Information [Line Items]
Impairments		(1)	(24)	6
Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Impairments		$ 0	$ 695	$ 0

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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