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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of discontinued operations [line items]      
Purchases of property, plant and equipment $ 4,979 $ 3,697 $ 5,707
Capitalised exploration 641 610 419
Proceeds from sale of assets 89 529 93
Net repayment of interest bearing liabilities 4,188 7,114 2,781
Dividends paid to non-controlling interests 1,582 575 62
Discontinued operations [member]      
Disclosure of discontinued operations [line items]      
Purchases of property, plant and equipment 900 555 1,239
Capitalised exploration 2
Proceeds from sale of assets 39 118 14
Net repayment of interest bearing liabilities 4 6 7
Distribution (contribution) to non-controlling interests 14 16 (1)
Dividends paid to non-controlling interests $ 22 $ 6 $ 26