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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of analysis of single amount of discontinued operations [line items]      
Purchases of property, plant and equipment $ 6,250 $ 4,979 $ 3,697
Proceeds from sale of assets 145 89 529
Net repayment of interest bearing liabilities 2,604 4,188 7,114
Dividends paid to non-controlling interests 1,198 1,582 575
Discontinued operations [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Purchases of property, plant and equipment 443 900 555
Proceeds from sale of assets 0 39 118
Net repayment of interest bearing liabilities 6 4 6
Distribution (contribution) to non-controlling interests 0 14 16
Dividends paid to non-controlling interests $ 7 $ 22 $ 6