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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of analysis of single amount of discontinued operations [line items]      
Purchases of property, plant and equipment $ 6,606 $ 6,900 $ 6,250
Net repayment of interest bearing liabilities 8,395 2,047 2,604
Dividends paid to non-controlling interests $ 2,127 $ 1,043 1,198
Discontinued operations [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Purchases of property, plant and equipment     443
Net repayment of interest bearing liabilities     6
Dividends paid to non-controlling interests     $ 7