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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 56 $ 1,912  
Deferred tax liabilities 3,063 3,314  
Charged/(credited) to the income statement 125 1,325 $ (335)
Depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (526) (1,349)  
Deferred tax liabilities 4,844 4,716  
Charged/(credited) to the income statement 554 488 1,394
Exploration expenditure [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 9 51  
Charged/(credited) to the income statement 13 347 51
Employee benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 21 94  
Deferred tax liabilities (322) (333)  
Charged/(credited) to the income statement 20 (68) (38)
Closure and rehabilitations [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 104 638  
Deferred tax liabilities (1,448) (2,086)  
Charged/(credited) to the income statement 24 (515) (334)
Resource rent tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets   122  
Deferred tax liabilities   368  
Charged/(credited) to the income statement (129) (309) (119)
Other provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 70 108  
Deferred tax liabilities (192) (227)  
Charged/(credited) to the income statement 49 77 (268)
Deferred income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 51 11  
Deferred tax liabilities (1) (16)  
Charged/(credited) to the income statement (31) (31) 33
Deferred charges [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (57) (36)  
Deferred tax liabilities 584 602  
Charged/(credited) to the income statement 7 68 (132)
Investments, including foreign tax credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 139 147  
Deferred tax liabilities 365 671  
Charged/(credited) to the income statement (298) 414 (77)
Foreign exchange gains and losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (13) (3)  
Deferred tax liabilities 154 133  
Charged/(credited) to the income statement 33 63 (18)
Tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 225 1,999  
Deferred tax liabilities (307) (82)  
Charged/(credited) to the income statement 28 678 (148)
Lease liability [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 17 68  
Deferred tax liabilities (594) (658)  
Charged/(credited) to the income statement (10) 67 (793)
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 16 62  
Deferred tax liabilities (20) 226  
Charged/(credited) to the income statement $ (135) $ 46 $ 114