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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, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	$ 26,183	$ 38,175	$ 47,534
Future production costs	(9,464)	(10,086)	(17,028)
Future development costs	(7,799)	(8,602)	(10,585)
Future income taxes	(1,540)	(4,919)	(4,056)
Future net cash flows	7,380	14,568	15,865
Discount at 10 per cent per annum	(2,322)	(5,416)	(5,625)
Standardised measure	5,058	9,152	10,240	$ 8,242
Australia [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	11,526	18,292	17,398
Future production costs	(4,027)	(4,710)	(5,345)
Future development costs	(4,124)	(3,860)	(3,842)
Future income taxes	(187)	(2,551)	(1,919)
Future net cash flows	3,188	7,171	6,292
Discount at 10 per cent per annum	(642)	(1,926)	(1,713)
Standardised measure	2,546	5,245	4,579
United States [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	12,997	18,076	28,012
Future production costs	(4,943)	(4,917)	(11,182)
Future development costs	(3,242)	(4,516)	(6,554)
Future income taxes	(880)	(1,657)	(1,236)
Future net cash flows	3,932	6,986	9,040
Discount at 10 per cent per annum	(1,586)	(3,396)	(3,783)
Standardised measure	2,346	3,590	5,257
Other countries [member]
Discounted future net cash flows relating to proved oil and gas reserves [line items]
Future cash inflows	1,660	1,807	2,124
Future production costs	(494)	(459)	(501)
Future development costs	(433)	(226)	(189)
Future income taxes	(473)	(711)	(901)
Future net cash flows	260	411	533
Discount at 10 per cent per annum	(94)	(94)	(129)
Standardised measure	$ 166	$ 317	$ 404

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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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