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Deferred Tax Balances - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Unrecognized deferred tax assets and liabilities [line items]    
Deferred tax assets not arising from the reversal of existing deferred tax liabilities $ 3,688 $ 3,764
Tax losses [member]    
Unrecognized deferred tax assets and liabilities [line items]    
Deferred tax assets not arising from the reversal of existing deferred tax liabilities $ 2,865 $ 2,229