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Ageing of Capitalised Exploratory Well Costs (Detail) $ in Millions | Jun. 30, 2021 USD ($) Project | Jun. 30, 2020 USD ($) Project | Jun. 30, 2019 USD ($) Project | Jun. 30, 2018 USD ($)
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Extractive Industries [Abstract] |  |  |  |
Exploratory well costs capitalised for a period of one year or less | $ 7 | $ 120 | $ 210 |
Exploratory well costs capitalised for a period greater than one year | 1,023 | 969 | 830 |
At the end of the year | $ 1,030 | $ 1,089 | $ 1,040 | $ 794
Number of projects that have been capitalised for a period greater than one year | Project | 15 | 14 | 13 |

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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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