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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, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | $ 0 | $ 0 | $ 0
Acquisitions of unproved property | 5 | 9 | 74
Exploration | 726 | 734 | 738
Development | 978 | 1,777 | 1,412
Total costs | 1,709 | 2,520 | 2,224
Australia [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | 0 | 0 | 0
Exploration | 44 | 25 | 32
Development | 132 | 195 | 360
Total costs | 176 | 220 | 392
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 | 5 | 9 | 12
Exploration | 190 | 418 | 471
Development | 792 | 1,548 | 1,034
Total costs | 987 | 1,975 | 1,517
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 | 492 | 291 | 235
Development | 54 | 34 | 18
Total costs | $ 546 | $ 325 | $ 315

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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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