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Costs Incurred Relating to Oil and Gas Property Acquisition, Exploration and Development Activities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Acquisitions of proved property | $ 0 | $ 0 | $ 0
Acquisitions of unproved property | 9 | 74 | 64
Exploration | 734 | 738 | 621
Development | 1,777 | 1,412 | 1,866
Total costs | 2,520 | 2,224 | 2,551
Australia [member] |  |  |
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Acquisitions of proved property | 0 | 0 | 0
Acquisitions of unproved property |  |  | 22
Exploration | 25 | 32 | 42
Development | 195 | 360 | 412
Total costs | 220 | 392 | 476
United States [member] |  |  |
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Acquisitions of proved property | 0 | 0 | 0
Acquisitions of unproved property | 9 | 12 | 42
Exploration | 418 | 471 | 385
Development | 1,548 | 1,034 | 1,254
Total costs | 1,975 | 1,517 | 1,681
Other countries [member] |  |  |
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Acquisitions of proved property | 0 | 0 | 0
Acquisitions of unproved property |  | 62 |
Exploration | 291 | 235 | 194
Development | 34 | 18 | 200
Total costs | $ 325 | $ 315 | $ 394

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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447 + Details
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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447 + Details
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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447 + Details
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- Definition Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense. + References No definition available. + Details
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