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Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($)
$ in Millions
 12 Months Ended
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)