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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items]      
Purchases of property, plant and equipment $ 6,900 $ 6,250 $ 4,979
Proceeds from sale of assets 265 145 89
Net repayment of interest bearing liabilities 2,047 2,604 4,188
Dividends paid to non-controlling interests $ 1,043 1,198 1,582
Discontinued operations [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Purchases of property, plant and equipment   443 900
Proceeds from sale of assets   0 39
Net repayment of interest bearing liabilities   6 4
Distribution (contribution) to non-controlling interests   0 14
Dividends paid to non-controlling interests   $ 7 $ 22