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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, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Total costs capitalised during the year | $ 1,178 | $ 1,275 | $ 1,970
Total costs | 1,738 | 1,709 | 2,520
United States [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Total costs | 992 | 987 | 1,975
Discontinued operations - Onshore US Cash Generating Units [member] | United States [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Total costs | $ 0 | $ 331 | $ 1,081

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