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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Income and capital tax losses with a tax benefit, which are not recognised as deferred tax assets $ 1,946 $ 1,844
Tax credits, which are not recognised as deferred tax assets 1,082 843
Gross amount of income tax losses 6,240  
Gross amount of tax losses not recognised 9,855  
Investments, including foreign tax credits [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Temporary difference for which no deferred tax asset is recognised 1,659 856
Deferred tax liabilities associated with undistributed earnings of subsidiaries that have not been recognised 2,216 2,500
Australian petroleum resource rent tax [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Temporary difference for which no deferred tax asset is recognised 2,282 2,293
Temporary difference for which no deferred tax liability is recognised 685 694
Mineral rights [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Temporary difference for which no deferred tax asset is recognised 2,263 2,293
Other [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Temporary difference for which no deferred tax asset is recognised 437 $ 478
Due not later than one year [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Gross amount of income tax losses 363  
In more than one year but not more than two years [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Gross amount of income tax losses 402  
In more than two years but not more than five years [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Gross amount of income tax losses 897  
Gross amount of capital tax losses 144  
Later than five years and not later than 10 years [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Tax credits, which are not recognised as deferred tax assets 831  
Gross amount of income tax losses 398  
Later than 10 years and not later than 20 years [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Tax credits, which are not recognised as deferred tax assets 251  
Gross amount of income tax losses 2,446  
Unlimited [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Gross amount of income tax losses 1,734  
Gross amount of capital tax losses $ 3,471