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Standardised Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Standardised Measure) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	$ 23,946	$ 26,183	$ 38,175
Future production costs	(9,323)	(9,464)	(10,086)
Future development costs	(7,375)	(7,799)	(8,602)
Future income taxes	(676)	(1,540)	(4,919)
Future net cash flows	6,572	7,380	14,568
Discount at 10 per cent per annum	(1,721)	(2,322)	(5,416)
Standardised measure	4,851	5,058	9,152	$ 10,240
Australia [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	8,948	11,526	18,292
Future production costs	(3,783)	(4,027)	(4,710)
Future development costs	(4,118)	(4,124)	(3,860)
Future income taxes	706	(187)	(2,551)
Future net cash flows	1,753	3,188	7,171
Discount at 10 per cent per annum	(160)	(642)	(1,926)
Standardised measure	1,593	2,546	5,245
United States [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	13,437	12,997	18,076
Future production costs	(5,122)	(4,943)	(4,917)
Future development costs	(2,996)	(3,242)	(4,516)
Future income taxes	(944)	(880)	(1,657)
Future net cash flows	4,375	3,932	6,986
Discount at 10 per cent per annum	(1,468)	(1,586)	(3,396)
Standardised measure	2,907	2,346	3,590
Other countries [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	1,561	1,660	1,807
Future production costs	(418)	(494)	(459)
Future development costs	(261)	(433)	(226)
Future income taxes	(438)	(473)	(711)
Future net cash flows	444	260	411
Discount at 10 per cent per annum	(93)	(94)	(94)
Standardised measure	$ 351	$ 166	$ 317

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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.

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- Definition

Amount of estimated future accumulated cash inflow from the sale of 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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- Definition

Amount of estimated future accumulated cash outflow for costs to be incurred in developing 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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- Definition

Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of 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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- Definition

Amount, after future accumulated cash outflow for development and production costs and future income tax, of estimated future accumulated cash inflow from the sale of 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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- Definition

Amount of estimated future accumulated cash outflow for costs to be incurred in producing 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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- Definition

Amount of discount on future accumulated cash inflow, after deducting future accumulated cash outflow for development and production costs and future income tax, from sale of proved oil and gas reserves, using a discount rate of ten percent a year.

+ 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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- 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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