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Capitalised Costs Relating to Oil and Gas Production Activities (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
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Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | $ 1,334 | $ 1,394 | $ 1,343
Proved properties | 33,064 | 31,360 | 29,890
Total costs | 34,398 | 32,754 | 31,233
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (22,532) | (21,519) | (20,508)
Net capitalised costs | 11,866 | 11,235 | 10,725
Australia [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties |  | 10 | 10
Proved properties | 17,882 | 17,079 | 16,514
Total costs | 17,882 | 17,089 | 16,524
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (12,720) | (11,423) | (10,867)
Net capitalised costs | 5,162 | 5,666 | 5,657
United States [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 754 | 808 | 875
Proved properties | 13,210 | 12,538 | 11,751
Total costs | 13,964 | 13,346 | 12,626
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (8,329) | (8,726) | (8,339)
Net capitalised costs | 5,635 | 4,620 | 4,287
Other countries [member] |  |  |
Capitalized costs relating to oil and gas producing activities by geographic area [line items] |  |  |
Unproved properties | 580 | 576 | 458
Proved properties | 1,972 | 1,743 | 1,625
Total costs | 2,552 | 2,319 | 2,083
Less: Accumulated depreciation, depletion, amortisation and valuation provisions | (1,483) | (1,370) | (1,302)
Net capitalised costs | $ 1,069 | $ 949 | $ 781

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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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