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Capitalised Costs Relating to Oil and Gas Production Activities (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
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Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | $ 1,343 | $ 4,740 | $ 5,543
Proved properties | 29,890 | 62,567 | 60,431
Total costs | 31,233 | 67,307 | 65,974
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (20,508) | (45,486) | (42,038)
Net capitalised costs | 10,725 | 21,821 | 23,936
Australia [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 10 | 10 | 94
Proved properties | 16,514 | 16,258 | 16,190
Total costs | 16,524 | 16,268 | 16,284
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (10,867) | (9,984) | (9,085)
Net capitalised costs | 5,657 | 6,284 | 7,199
United States [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 875 | 4,528 | 5,284
Proved properties | 11,751 | 43,885 | 41,837
Total costs | 12,626 | 48,413 | 47,121
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (8,339) | (33,437) | (30,969)
Net capitalised costs | 4,287 | 14,976 | 16,152
Other countries [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 458 | 202 | 165
Proved properties | 1,625 | 2,424 | 2,404
Total costs | 2,083 | 2,626 | 2,569
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (1,302) | (2,065) | (1,984)
Net capitalised costs | $ 781 | $ 561 | $ 585

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