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Standardised Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Standardised Measure) (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Standardised measure	$ 5,058	$ 9,152	$ 10,240	$ 8,242
United States [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Standardised measure	2,346	3,590	5,257
Discontinued operations - Onshore US Cash Generating Units [member] | United States [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Standardised measure	$ 0	$ 0	$ 1,932

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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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- Definition

Amount of discounted future accumulated cash inflow relating to proved oil and gas reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

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