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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Unrecognised deferred tax assets    
Tax losses and tax credits $ 3,720 $ 3,028
Total unrecognised deferred tax assets 10,215 9,669
Unrecognised deferred tax liabilities    
Total unrecognised deferred tax liabilities 2,912 2,901
Investments, including foreign tax credits [member]    
Unrecognised deferred tax assets    
Temporary differences 1,656 1,659
Unrecognised deferred tax liabilities    
Investments in subsidiaries 2,253 2,216
Australian petroleum resource rent tax [member]    
Unrecognised deferred tax assets    
Temporary differences 2,197 2,282
Unrecognised deferred tax liabilities    
Taxable temporary differences relating to unrecognised deferred tax asset for PRRT 659 685
Mineral rights [member]    
Unrecognised deferred tax assets    
Temporary differences 2,230 2,263
Other [member]    
Unrecognised deferred tax assets    
Temporary differences $ 412 $ 437