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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, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | $ 642 |  |
Acquisitions of unproved property | 19 | $ 44 | $ 5
Exploration | 499 | 686 | 726
Development | 1,134 | 1,008 | 978
Total costs | 2,294 | 1,738 | 1,709
Australia [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Exploration | 23 | 38 | 44
Development | 201 | 232 | 132
Total costs | 224 | 270 | 176
United States [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | 642 |  |
Acquisitions of unproved property | 19 | 38 | 5
Exploration | 166 | 278 | 190
Development | 749 | 676 | 792
Total costs | 1,576 | 992 | 987
Other countries [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of unproved property |  | 6 |
Exploration | 310 | 370 | 492
Development | 184 | 100 | 54
Total costs | $ 494 | $ 476 | $ 546

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- Definition Costs incurred acquisition of oil and gas properties with proved reserves. + References No definition available. + Details
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- Definition Costs incurred acquisition of unproved oil and gas properties. + References No definition available. + Details
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- Definition Costs incurred development costs. + References No definition available. + Details
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- Definition Costs incurred exploration costs. + References No definition available. + Details
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