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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, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | $ 6,689 | $ 7,397 | $ 6,711
Production costs | (1,438) | (2,134) | (2,248)
Exploration expenses | (435) | (549) | (480)
Depreciation, depletion, amortisation and valuation provision | (1,641) | (3,968) | (3,497)
Production taxes | (223) | (172) | (162)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 2,952 | 574 | 324
Accretion expense | (127) | (141) | (102)
Income taxes | (990) | (1,265) | (117)
Royalty-related taxes | (164) | (103) | (104)
Results of oil and gas producing activities | 1,671 | (935) | 1
Australia [member] |  |  |
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | 3,404 | 3,229 | 2,876
Production costs | (752) | (701) | (533)
Exploration expenses | (44) | (25) | (32)
Depreciation, depletion, amortisation and valuation provision | (917) | (1,045) | (814)
Production taxes | (198) | (171) | (158)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 1,493 | 1,287 | 1,339
Accretion expense | (80) | (81) | (56)
Income taxes | (530) | (418) | (361)
Royalty-related taxes | (164) | (103) | (104)
Results of oil and gas producing activities | 719 | 685 | 818
United States [member] |  |  |
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | 2,675 | 3,747 | 3,479
Production costs | (568) | (1,312) | (1,515)
Exploration expenses | (162) | (270) | (242)
Depreciation, depletion, amortisation and valuation provision | (621) | (2,842) | (2,592)
Production taxes |  |  | (4)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 1,324 | (677) | (874)
Accretion expense | (34) | (46) | (32)
Income taxes | (193) | (723) | 386
Results of oil and gas producing activities | 1,097 | (1,446) | (520)
Other countries [member] |  |  |
Results of operations for oil and gas producing activities by geographic area [line items] |  |  |
Oil and gas revenue | 610 | 421 | 356
Production costs | (118) | (121) | (200)
Exploration expenses | (229) | (254) | (206)
Depreciation, depletion, amortisation and valuation provision | (103) | (81) | (91)
Production taxes | (25) | (1) |
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total | 135 | (36) | (141)
Accretion expense | (13) | (14) | (14)
Income taxes | (267) | (124) | (142)
Results of oil and gas producing activities | $ (145) | $ (174) | $ (297)

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