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Deed of Cross Guarantee - Summary of Consolidated Statement of Comprehensive Income and Retained Earnings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of comprehensive income and retained earnings [line items]      
Revenue $ 44,288 $ 43,129 $ 35,740
Other income 393 247 662
Expenses excluding net finance costs (28,022) (27,527) (24,120)
Net finance costs (1,064) (1,245) (1,417)
Income tax expense (5,529) (7,007) (4,443)
Profit after taxation 9,185 4,823 6,222
Total other comprehensive income (25) (97) (49)
Total comprehensive income 9,160 4,726 6,173
Retained earnings at the beginning of the financial year 51,064    
Profit after taxation for the year 9,185 4,823 6,222
Shares bought back and cancelled (5,274)    
Dividends (12,507) (6,720) (3,472)
Retained earnings at the end of the financial year 42,819 51,064  
Deed of Cross Guarantee [member]      
Disclosure of comprehensive income and retained earnings [line items]      
Revenue 22,660 20,434  
Other income 2,881 3,188  
Expenses excluding net finance costs (14,610) (12,693)  
Net finance costs (414) (470)  
Income tax expense (2,317) (2,218)  
Profit after taxation 8,200 8,241  
Total other comprehensive income 10 12  
Total comprehensive income 8,210 8,253  
Retained earnings at the beginning of the financial year 48,442 45,979  
Net effect on retained earnings of entities added to/removed from the Deed (34) 48  
Profit after taxation for the year 8,200 8,241  
Transfers to and from reserves (31) (15)  
Shares bought back and cancelled (5,199)    
Dividends (6,655) (5,811)  
Retained earnings at the end of the financial year $ 44,723 $ 48,442 $ 45,979