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Ageing of Capitalised Exploratory Well Costs (Detail) $ in Millions | Jun. 30, 2019 USD ($) Project | Jun. 30, 2018 USD ($) Project | Jun. 30, 2017 USD ($) Project | Jun. 30, 2016 USD ($)
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Extractive Industries [Abstract] |  |  |  |
Exploratory well costs capitalised for a period of one year or less | $ 210 | $ 124 | $ 120 |
Exploratory well costs capitalised for a period greater than one year | 830 | 670 | 548 |
At the end of the year | $ 1,040 | $ 794 | $ 668 | $ 770
Number of projects that have been capitalised for a period greater than one year | Project | 13 | 17 | 14 |

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- Definition Capitalized exploratory well costs that have been capitalized for period greater than one year. + References No definition available. + Details
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- Definition Capitalized exploratory well costs that have been capitalized for period of one year or less. + References No definition available. + Details
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- Definition Number of projects that have exploratory well costs that have been capitalized for period greater than one year. + References No definition available. + Details
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- References No definition available. + Details
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