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Impairment Of Exploration And Evaluation, Property, Plant And Equipment And Goodwill - Summary of Impairment Reversals (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
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
Decrease (42)
Wheatstone [member] | WDS Australia Segment [Member]  
Summary of impairment reversals [Line Items]  
Increase (88)
Decrease 94
Wheatstone [member] | Brent Price Measurement Input [member] | WDS Australia Segment [Member]  
Summary of impairment reversals [Line Items]  
Increase 431
Decrease (370)
Wheatstone [member] | FX Measurement Input [member] | WDS Australia Segment [Member]  
Summary of impairment reversals [Line Items]  
Increase (36)
Decrease $ 87