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Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Results of operations for oil and gas producing activities by geographic area [line items]      
Oil and gas revenue $ 3,884 $ 3,986 $ 6,689
Production costs (847) (816) (1,438)
Exploration expenses (492) (560) (435)
Depreciation, depletion, amortisation and valuation provision (1,812) (1,457) (1,641)
Production taxes (136) (191) (223)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total 597 962 2,952
Accretion expense (118) (112) (127)
Income taxes (239) (467) (990)
Royalty-related taxes 11 (85) (164)
Results of oil and gas producing activities 251 298 1,671
Australia [member]      
Results of operations for oil and gas producing activities by geographic area [line items]      
Oil and gas revenue 2,272 2,535 3,404
Production costs (487) (575) (752)
Exploration expenses (23) (37) (44)
Depreciation, depletion, amortisation and valuation provision (1,210) (906) (917)
Production taxes (125) (177) (198)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total 427 840 1,493
Accretion expense (89) (78) (80)
Income taxes (46) (275) (530)
Royalty-related taxes 11 (85) (164)
Results of oil and gas producing activities 303 402 719
United States [member]      
Results of operations for oil and gas producing activities by geographic area [line items]      
Oil and gas revenue 1,244 1,101 2,675
Production costs (267) (161) (568)
Exploration expenses (164) (271) (162)
Depreciation, depletion, amortisation and valuation provision (489) (476) (621)
Production taxes   (1)  
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total 324 192 1,324
Accretion expense (22) (24) (34)
Income taxes (78) (35) (193)
Results of oil and gas producing activities 224 133 1,097
Other countries [member]      
Results of operations for oil and gas producing activities by geographic area [line items]      
Oil and gas revenue 368 350 610
Production costs (93) (80) (118)
Exploration expenses (305) (252) (229)
Depreciation, depletion, amortisation and valuation provision (113) (75) (103)
Production taxes (11) (13) (25)
Results of operations, income before accretion expense, income taxes, and royalty-related taxes, Total (154) (70) 135
Accretion expense (7) (10) (13)
Income taxes (115) (157) (267)
Results of oil and gas producing activities $ (276) $ (237) $ (145)