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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, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Total costs capitalised during the year | $ 1,275 | $ 1,970 | $ 1,744
Total costs | 1,709 | 2,520 | 2,224
United States [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Total costs | 987 | 1,975 | 1,517
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 | $ 331 | $ 1,081 | $ 608

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