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Capitalised Costs Relating to Oil and Gas Production Activities (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Capitalized costs relating to oil and gas producing activities by geographic area [line items]
Net capitalised costs	$ 11,235	$ 10,725	$ 21,821
United States [member]
Capitalized costs relating to oil and gas producing activities by geographic area [line items]
Net capitalised costs	4,620	4,287	14,976
Discontinued operations - Onshore US Cash Generating Units [member] | United States [member]
Capitalized costs relating to oil and gas producing activities by geographic area [line items]
Net capitalised costs	$ 0	$ 0	$ 10,672

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- Definition

Net amount of capitalized costs relating to oil and gas producing activities.

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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- Details

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- Details

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