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Deferred Tax Balances - Summary of Composition of Net Deferred Tax Assets and Liabilities and Deferred Tax Expense Charged/(Credited) to Income Statement (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets $ 4,041 $ 5,788  
Deferred tax liabilities 3,472 3,765  
Charged/(credited) to the income statement 1,445 (188) $ (3,508)
Depreciation [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets (2,756) (3,454)  
Deferred tax liabilities 1,356 1,411  
Charged/(credited) to the income statement (752) 391 (2,282)
Exploration expenditure [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 492 543  
Deferred tax liabilities  
Charged/(credited) to the income statement 51 (22) (3)
Employee benefits [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 321 379  
Deferred tax liabilities (2) 3  
Charged/(credited) to the income statement 31 (37) 56
Closure and rehabilitation provisions [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 1,627 1,809  
Deferred tax liabilities (194) (230)  
Charged/(credited) to the income statement 218 (151) 36
Resource rent tax [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 468 559  
Deferred tax liabilities 1,328 1,614  
Charged/(credited) to the income statement (194) (189) (8)
Other provisions [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 141 131  
Deferred tax liabilities (2) (1)  
Charged/(credited) to the income statement (11) 14 8
Deferred income [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 21 (2)  
Deferred tax liabilities   (10)  
Charged/(credited) to the income statement (13) 3 (49)
Deferred charges [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets (374) (443)  
Deferred tax liabilities 272 322  
Charged/(credited) to the income statement (119) (77) 62
Investments, including foreign tax credits [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 546 1,145  
Deferred tax liabilities 691 648  
Charged/(credited) to the income statement 615 (17) (284)
Foreign exchange gains and losses [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets (120) (87)  
Deferred tax liabilities 16 69  
Charged/(credited) to the income statement (20) (77) (310)
Tax losses [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 3,758 5,352  
Deferred tax liabilities  
Charged/(credited) to the income statement 1,595 (381) (809)
Other [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets (83) (144)  
Deferred tax liabilities 7 (61)  
Charged/(credited) to the income statement $ 44 $ 355 $ 75