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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Unrecognised deferred tax assets    
Tax losses and tax credits $ 3,028 $ 2,687
Total unrecognised deferred tax assets 9,669 8,607
Unrecognised deferred tax liabilities    
Total unrecognised deferred tax liabilities 2,901 3,194
Investments, including foreign tax credits [Member]    
Unrecognised deferred tax assets    
Temporary differences 1,659 856
Unrecognised deferred tax liabilities    
Investments in subsidiaries 2,216 2,500
Australian petroleum resource rent tax [Member]    
Unrecognised deferred tax assets    
Temporary differences 2,282 2,293
Unrecognised deferred tax liabilities    
Taxable temporary differences relating to unrecognised deferred tax asset for PRRT 685 694
Mineral rights [Member]    
Unrecognised deferred tax assets    
Temporary differences 2,263 2,293
Other [Member]    
Unrecognised deferred tax assets    
Temporary differences $ 437 $ 478