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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 1,912 $ 3,688  
Deferred tax liabilities 3,314 3,779  
Charged/(credited) to the income statement 1,325 (335) $ 81
Depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (1,349) (2,749)  
Deferred tax liabilities 4,716 2,828  
Charged/(credited) to the income statement 488 1,394 (951)
Exploration expenditure [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 51 398  
Charged/(credited) to the income statement 347 51 43
Employee benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 94 353  
Deferred tax liabilities (333) (26)  
Charged/(credited) to the income statement (68) (38) 14
Closure and rehabilitation provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 638 2,100  
Deferred tax liabilities (2,086) (109)  
Charged/(credited) to the income statement (515) (334) (53)
Resource rent tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 122 359  
Deferred tax liabilities 368 921  
Charged/(credited) to the income statement (309) (119) (179)
Other provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 108 173  
Deferred tax liabilities (227) (239)  
Charged/(credited) to the income statement 77 (268) (2)
Deferred income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 11 (4)  
Deferred tax liabilities (16)    
Charged/(credited) to the income statement (31) 33 (9)
Deferred charges [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (36) (383)  
Deferred tax liabilities 602 187  
Charged/(credited) to the income statement 68 (132) 56
Investments, including foreign tax credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 147 348  
Deferred tax liabilities 671 458  
Charged/(credited) to the income statement 414 (77) 70
Foreign exchange gains and losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (3) (134)  
Deferred tax liabilities 133 (61)  
Charged/(credited) to the income statement 63 (18) (45)
Tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,999 2,759  
Deferred tax liabilities (82)    
Charged/(credited) to the income statement 678 (148) 1,147
Lease liability [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 68 548  
Deferred tax liabilities (658) (245)  
Charged/(credited) to the income statement 67 (793)  
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 62 (80)  
Deferred tax liabilities 226 65  
Charged/(credited) to the income statement $ 46 $ 114 $ (10)