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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Jun. 30, 2021
Unrecognised deferred tax assets    
Tax losses and tax credits $ 8,462 $ 5,944
Total unrecognised deferred tax assets 14,617 15,047
Unrecognised deferred tax liabilities    
Investments in subsidiaries 2,099 2,203
Future taxable temporary differences relating to unrecognised deferred tax asset for PRRT   720
Total unrecognised deferred tax liabilities 2,099 2,923
Investments in subsidiaries [member]    
Unrecognised deferred tax assets    
Temporary differences 1,597 1,712
Deductible temporary differences relating to PRRT [member]    
Unrecognised deferred tax assets    
Temporary differences   2,402
Mineral rights [member]    
Unrecognised deferred tax assets    
Temporary differences 2,781 3,359
Other deductible temporary differences [member]    
Unrecognised deferred tax assets    
Temporary differences $ 1,777 $ 1,630