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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 3,764 $ 4,041  
Deferred tax liabilities 3,234 3,472  
Charged/(credited) to the income statement 81 1,445 $ (188)
Depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (1,717) (2,756)  
Deferred tax liabilities 1,444 1,356  
Charged/(credited) to the income statement (951) (752) 391
Exploration expenditure [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 449 492  
Charged/(credited) to the income statement 43 51 (22)
Employee benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 310 321  
Deferred tax liabilities (6) (2)  
Charged/(credited) to the income statement 14 31 (37)
Closure and rehabilitation provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,671 1,627  
Deferred tax liabilities (203) (194)  
Charged/(credited) to the income statement (53) 218 (151)
Resource rent tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 431 468  
Deferred tax liabilities 1,112 1,328  
Charged/(credited) to the income statement (179) (194) (189)
Other provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 144 141  
Deferred tax liabilities (1) (2)  
Charged/(credited) to the income statement (2) (11) 14
Deferred income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 24 21  
Deferred tax liabilities (5)    
Charged/(credited) to the income statement (9) (13) 3
Deferred charges [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (416) (374)  
Deferred tax liabilities 286 272  
Charged/(credited) to the income statement 56 (119) (77)
Investments, including foreign tax credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 412 546  
Deferred tax liabilities 600 691  
Charged/(credited) to the income statement 70 615 (17)
Foreign exchange gains and losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (97) (120)  
Deferred tax liabilities (6) 16  
Charged/(credited) to the income statement (45) (20) (77)
Tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,611 3,758  
Charged/(credited) to the income statement 1,147 1,595 (381)
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (58) (83)  
Deferred tax liabilities 13 7  
Charged/(credited) to the income statement $ (10) $ 44 $ 355