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Costs Incurred Relating to Oil and Gas Property Acquisition, Exploration and Development Activities (Parenthetical) (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] |  |  |
Total costs capitalised during the year | $ 1,160 | $ 1,178 | $ 1,275
Total costs | 2,294 | 1,738 | 1,709
Discontinued operations [member] | Onshore US [Member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Total costs | $ 0 | $ 0 | $ 331

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- Definition Costs capitalized oil and gas property acquisition exploration and development activities. + References No definition available. + Details
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- Definition Costs incurred oil and gas property acquisition exploration and development activities. + References No definition available. + Details
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- Details
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- Details
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