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