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Changes in the Standardised Measure (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Extractive Industries [Abstract] |  |  |
Standardised measure at the beginning of the year | $ 5,058 | $ 9,152 | $ 10,240
Revisions: |  |  |
Prices, net of production costs | (175) | (5,633) | 3,821
Changes in future development costs | (238) | 330 | (228)
Revisions of reserves quantity estimates | (107) | (229) | 1,268
Accretion of discount | 678 | 1,313 | 1,178
Changes in production timing and other | 360 | (310) | (618)
Revisions | 5,576 | 4,623 | 15,661
Sales of oil and gas, net of production costs | (2,901) | (2,980) | (5,029)
Acquisitions of reserves-in-place | 462 |  |
Sales of reserves-in-place | 44 |  | (1,489)
Previously estimated development costs incurred | 1,075 | 1,005 | 545
Extensions, discoveries, and improved recoveries, net of future costs | 17 | 145 | (33)
Changes in future income taxes | 578 | 2,265 | (503)
Standardised measure at the end of the year | $ 4,851 | $ 5,058 | $ 9,152

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- Definition Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place. + 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 increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's 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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