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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of comprehensive income and retained earnings [Line Items]      
Revenue $ 43,638 $ 36,135 $ 28,567
Other income 247 662 432
Expenses excluding net finance costs (28,036) (24,515) (24,091)
Net finance costs (1,245) (1,417) (1,013)
Income tax expense (7,007) (4,443) (2,103)
Profit after taxation 4,823 6,222 (6,207)
Total other comprehensive income (97) (49) 23
Total comprehensive income 4,726 6,173 (6,184)
Retained earnings at the beginning of the financial year 52,618    
Profit after taxation for the year 4,823 6,222 (6,207)
Dividends (6,720) (3,472) (4,326)
Retained earnings at the end of the financial year 51,064 52,618  
Deed of Cross Guarantee [member]      
Disclosure of comprehensive income and retained earnings [Line Items]      
Revenue 20,434 19,394  
Other income 3,188 4,988  
Expenses excluding net finance costs (12,693) (12,085)  
Net finance costs (470) (591)  
Income tax expense (2,218) (2,351)  
Profit after taxation 8,241 9,355  
Total other comprehensive income 12 18  
Total comprehensive income 8,253 9,373  
Retained earnings at the beginning of the financial year 45,979 40,462  
Net effect on retained earnings of entities added to/removed from the Deed 48 (1,699)  
Profit after taxation for the year 8,241 9,355  
Transfers to and from reserves (15) 33  
Dividends (5,811) (2,172)  
Retained earnings at the end of the financial year $ 48,442 $ 45,979 $ 40,462