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Income Tax Expense - Summary of Factors Affecting Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income tax expense differs to the standard rate of corporation tax as follows:      
Profit before taxation $ 14,751 $ 11,137 $ 1,791
Income tax expense 6,879 4,276 1,858
Tax on profit at Australian prima facie tax rate of 30 per cent 4,425 3,341 537
Royalty-related taxation (net of income tax benefit) 128 167 245
Total taxation expense 7,007 4,443 2,103
US tax reform [Member]      
Income tax expense differs to the standard rate of corporation tax as follows:      
Tax on remitted and unremitted foreign earnings 194    
Non-tax effected operating losses and capital gains 834    
Tax rate changes 1,390    
Recognition of previously unrecognised tax assets (95)    
Other (3)    
Total taxation expense 2,320    
Items not related to US tax reform [member]      
Income tax expense differs to the standard rate of corporation tax as follows:      
Tax on remitted and unremitted foreign earnings 401 478 (376)
Non-tax effected operating losses and capital gains 721 242 457
Tax rate changes (79) 25 14
Amounts (over)/under provided in prior years (51) 175 (4)
Foreign exchange adjustments (152) 88 125
Investment and development allowance (180) (53) (36)
Tax effect of profit/(loss) from equity accounted investments, related impairments and expenses (44) (82) 631
Recognition of previously unrecognised tax assets (170) (21) (36)
Impact of tax rates applicable outside of Australia (484) (136) 5
Other $ 172 $ 219 $ 541