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Capitalised Costs Relating to Oil and Gas Production Activities (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
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Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | $ 1,394 | $ 1,343 | $ 4,740
Proved properties | 31,360 | 29,890 | 62,567
Total costs | 32,754 | 31,233 | 67,307
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (21,519) | (20,508) | (45,486)
Net capitalised costs | 11,235 | 10,725 | 21,821
Australia [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 10 | 10 | 10
Proved properties | 17,079 | 16,514 | 16,258
Total costs | 17,089 | 16,524 | 16,268
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (11,423) | (10,867) | (9,984)
Net capitalised costs | 5,666 | 5,657 | 6,284
United States [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 808 | 875 | 4,528
Proved properties | 12,538 | 11,751 | 43,885
Total costs | 13,346 | 12,626 | 48,413
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (8,726) | (8,339) | (33,437)
Net capitalised costs | 4,620 | 4,287 | 14,976
Other countries [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 576 | 458 | 202
Proved properties | 1,743 | 1,625 | 2,424
Total costs | 2,319 | 2,083 | 2,626
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (1,370) | (1,302) | (2,065)
Net capitalised costs | $ 949 | $ 781 | $ 561

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- Definition Capitalized costs accumulated depreciation depletion amortization and valuation allowance for relating to oil and gas producing activities. + References No definition available. + Details
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