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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. + Details
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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 + Details
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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 + Details
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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 + Details
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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 + Details
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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 + Details
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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 + 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 + Details
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