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Impairment of Exploration and Evaluation and Oil and Gas Properties - Summary of Impairment Reversals (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
WDS Shenzi [Member] | Producing [member]
Summary of impairment reversals [Line Items]
Increase	$ 47
Decrease	(46)
WDS Shenzi [Member] | WDS Australia Segment [Member]
Summary of impairment reversals [Line Items]
Increase	67
Decrease	71
WDS Shenzi [Member] | Brent Price Measurement Input [member] | WDS Australia Segment [Member]
Summary of impairment reversals [Line Items]
Increase	359
Decrease	(359)
Wheatstone [member] | Producing [member]
Summary of impairment reversals [Line Items]
Increase	90	$ 116
Decrease	(42)	(43)
Wheatstone [member] | WDS Australia Segment [Member]
Summary of impairment reversals [Line Items]
Increase	(88)	(117)
Decrease	94	127
Wheatstone [member] | Brent Price Measurement Input [member] | WDS Australia Segment [Member]
Summary of impairment reversals [Line Items]
Increase	431	294
Decrease	(370)	(294)
Wheatstone [member] | FX Measurement Input [member] | WDS Australia Segment [Member]
Summary of impairment reversals [Line Items]
Increase	(36)	(79)
Decrease	$ 87	$ 79

X

- Definition

The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible decrease in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2023-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2023-03-23

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X

- Definition

The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible increase in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2023-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2023-03-23

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X

- Definition

Summary of impairment reversals

+ References

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- Details

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