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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 3,688 $ 3,764  
Deferred tax liabilities 2,758 3,234  
Charged/(credited) to the income statement (335) 81 $ 1,445
Depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (2,749) (1,717)  
Deferred tax liabilities 1,807 1,444  
Charged/(credited) to the income statement 1,394 (951) (752)
Exploration expenditure [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 398 449  
Charged/(credited) to the income statement 51 43 51
Employee benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 353 310  
Deferred tax liabilities (26) (6)  
Charged/(credited) to the income statement (38) 14 31
Closure and rehabilitation provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,100 1,671  
Deferred tax liabilities (109) (203)  
Charged/(credited) to the income statement (334) (53) 218
Resource rent tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 359 431  
Deferred tax liabilities 921 1,112  
Charged/(credited) to the income statement (119) (179) (194)
Other provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 173 144  
Deferred tax liabilities (239) (1)  
Charged/(credited) to the income statement (268) (2) (11)
Deferred income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (4) 24  
Deferred tax liabilities 0 (5)  
Charged/(credited) to the income statement 33 (9) (13)
Deferred charges [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (383) (416)  
Deferred tax liabilities 187 286  
Charged/(credited) to the income statement (132) 56 (119)
Investments, including foreign tax credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 348 412  
Deferred tax liabilities 458 600  
Charged/(credited) to the income statement (77) 70 615
Foreign exchange gains and losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (134) (97)  
Deferred tax liabilities (61) (6)  
Charged/(credited) to the income statement (18) (45) (20)
Tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,759 2,611  
Charged/(credited) to the income statement (148) 1,147 1,595
Lease [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 548    
Deferred tax liabilities (245)    
Charged/(credited) to the income statement (793)    
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets (80) (58)  
Deferred tax liabilities 65 13  
Charged/(credited) to the income statement $ 114 $ (10) $ 44