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Borrowings - Schedule of Borrowings (Parenthetical) (Detail)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
New Foxtel [Member]        
Debt and Financial Instruments [Line Items]        
Undrawn commitments $ 306   $ 306  
Minimum [Member] | Australian BBSY [Member]        
Debt and Financial Instruments [Line Items]        
Interest rate margin     1.10%  
Minimum [Member] | New Foxtel [Member]        
Debt and Financial Instruments [Line Items]        
Percentage of applicable margin payable as commitment fee     40.00%  
Maximum [Member] | Australian BBSY [Member]        
Debt and Financial Instruments [Line Items]        
Interest rate margin     2.70%  
Maximum [Member] | New Foxtel [Member]        
Debt and Financial Instruments [Line Items]        
Percentage of applicable margin payable as commitment fee     45.00%  
REA Group [Member]        
Debt and Financial Instruments [Line Items]        
Maximum borrowing capacity under the revolving loan facility       $ 480
REA Group [Member] | Minimum [Member]        
Debt and Financial Instruments [Line Items]        
Interest rate margin     0.85%  
REA Group [Member] | Minimum [Member] | Australian BBSY [Member]        
Debt and Financial Instruments [Line Items]        
Interest rate margin     0.85%  
REA Group [Member] | Maximum [Member]        
Debt and Financial Instruments [Line Items]        
Interest rate margin     1.05%  
REA Group [Member] | Maximum [Member] | Australian BBSY [Member]        
Debt and Financial Instruments [Line Items]        
Interest rate margin     1.45%  
Credit Facility Fiscal 2016 Tranche 2 [Member] | REA Group [Member]        
Debt and Financial Instruments [Line Items]        
Repayment of revolving credit facility 87 $ 120    
Amounts drawn under credit facility $ 169   $ 169 $ 240