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Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | $ 3,986 | $ 6,689 | $ 7,397
Production costs | (816) | (1,438) | (2,134)
Exploration expenses | (560) | (435) | (549)
Depreciation, depletion, amortisation and valuation provision | (1,457) | (1,641) | (3,968)
Production taxes | (191) | (223) | (172)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 962 | 2,952 | 574
Accretion expense | (112) | (127) | (141)
Income taxes | (467) | (990) | (1,265)
Royalty-related taxes | (85) | (164) | (103)
Results of oil and gas producing activities | 298 | 1,671 | (935)
Australia [member] |  |  |
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | 2,535 | 3,404 | 3,229
Production costs | (575) | (752) | (701)
Exploration expenses | (37) | (44) | (25)
Depreciation, depletion, amortisation and valuation provision | (906) | (917) | (1,045)
Production taxes | (177) | (198) | (171)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 840 | 1,493 | 1,287
Accretion expense | (78) | (80) | (81)
Income taxes | (275) | (530) | (418)
Royalty-related taxes | (85) | (164) | (103)
Results of oil and gas producing activities | 402 | 719 | 685
United States [member] |  |  |
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | 1,101 | 2,675 | 3,747
Production costs | (161) | (568) | (1,312)
Exploration expenses | (271) | (162) | (270)
Depreciation, depletion, amortisation and valuation provision | (476) | (621) | (2,842)
Production taxes | (1) |  |
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 192 | 1,324 | (677)
Accretion expense | (24) | (34) | (46)
Income taxes | (35) | (193) | (723)
Royalty-related taxes | 0 | 0 | 0
Results of oil and gas producing activities | 133 | 1,097 | (1,446)
Other countries [member] |  |  |
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | 350 | 610 | 421
Production costs | (80) | (118) | (121)
Exploration expenses | (252) | (229) | (254)
Depreciation, depletion, amortisation and valuation provision | (75) | (103) | (81)
Production taxes | (13) | (25) | (1)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | (70) | 135 | (36)
Accretion expense | (10) | (13) | (14)
Income taxes | (157) | (267) | (124)
Royalty-related taxes | 0 | 0 | 0
Results of oil and gas producing activities | $ (237) | $ (145) | $ (174)

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