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Changes in the Standardised Measure (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Standardised measure at the beginning of the year | $ 8,242 | $ 8,987 | $ 17,244
Revisions: |  |  |
Prices, net of production costs | 5,540 | (96) | (14,146)
Changes in future development costs | (358) | 275 | 1,342
Revisions of quantity estimates | (166) | 2,961 | (2,870)
Accretion of discount | 1,016 | 1,147 | 2,547
Changes in production timing and other | 946 | (1,611) | 1,280
Revisions | 15,220 | 11,663 | 5,397
Sales of oil and gas, net of production costs | (5,091) | (4,301) | (3,936)
Acquisitions of reserves-in-place | 0 | 0 | 0
Sales of reserves-in-place | (26) | (15) | (114)
Previously estimated development costs incurred | 1,068 | 718 | 1,823
Extensions, discoveries, and improved recoveries, net of future costs | 502 | (401) | 84
Changes in future income taxes | (1,433) | 578 | 5,733
Standardised measure at the end of the year | $ 10,240 | $ 8,242 | $ 8,987

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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