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Capitalised Costs Relating to Oil and Gas Production Activities (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]      
Unproved properties $ 4,740 $ 5,543 $ 5,531
Proved properties 62,567 60,431 58,824
Total costs 67,307 65,974 64,355
Less: Accumulated depreciation, depletion, amortisation and valuation provisions (45,486) (42,038) (38,966)
Net capitalised costs 21,821 23,936 25,389
Australia [member]      
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]      
Unproved properties 10 94 338
Proved properties 16,258 16,190 15,523
Total costs 16,268 16,284 15,861
Less: Accumulated depreciation, depletion, amortisation and valuation provisions (9,984) (9,085) (8,364)
Net capitalised costs 6,284 7,199 7,497
United States [member]      
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]      
Unproved properties 4,528 5,284 5,074
Proved properties 43,885 41,837 40,929
Total costs 48,413 47,121 46,003
Less: Accumulated depreciation, depletion, amortisation and valuation provisions (33,437) (30,969) (28,664)
Net capitalised costs 14,976 16,152 17,339
Other countries [member]      
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]      
Unproved properties 202 165 119
Proved properties 2,424 2,404 2,372
Total costs 2,626 2,569 2,491
Less: Accumulated depreciation, depletion, amortisation and valuation provisions (2,065) (1,984) (1,938)
Net capitalised costs $ 561 $ 585 $ 553