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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, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Total costs capitalised during the year | $ 1,970 | $ 1,744 | $ 2,256
Total costs | 2,520 | 2,224 | 2,551
United States [member] |  |  |
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Total costs | 1,975 | 1,517 | 1,681
United States [member] | Discontinued Operations - Onshore US Cash Generating Units [Member] |  |  |
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items] |  |  |
Total costs | $ 1,081 | $ 608 | $ 862

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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 Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense. + References No definition available. + Details
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- Details
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