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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Unrecognised deferred tax assets    
Tax losses and tax credits $ 4,088 $ 3,720
Total unrecognised deferred tax assets 10,659 10,215
Unrecognised deferred tax liabilities    
Total unrecognised deferred tax liabilities 2,999 2,912
Investments, including foreign tax credits [member]    
Unrecognised deferred tax assets    
Temporary differences 1,575 1,656
Unrecognised deferred tax liabilities    
Investments in subsidiaries 2,375 2,253
Australian petroleum resource rent tax [member]    
Unrecognised deferred tax assets    
Temporary differences 2,079 2,197
Unrecognised deferred tax liabilities    
Future taxable temporary differences relating to unrecognised deferred tax asset for PRRT 624 659
Mineral rights [member]    
Unrecognised deferred tax assets    
Temporary differences 2,244 2,230
Other [member]    
Unrecognised deferred tax assets    
Temporary differences $ 673 $ 412