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Borrowings - Additional Information (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
AUD ($)
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]              
Long term debt $ 1,952,000,000 $ 1,952,000,000     $ 1,952,000,000   $ 379,000,000
Foxtel [Member]              
Debt Instrument [Line Items]              
Repayment of revolving credit facility   119,000,000          
Draw down on revolving credit facility   42,000,000          
Fair Value Hedging [Member] | Foxtel [Member] | Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Long term debt 74,000,000 74,000,000     74,000,000 $ 100  
Cash Flow Hedging [Member] | Foxtel [Member] | Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Long term debt 296,000,000 296,000,000     296,000,000 $ 400  
Foxtel and Fox Sports Australia [Member] | Foxtel [Member]              
Debt Instrument [Line Items]              
Long term debt $ 1,800,000,000 $ 1,800,000,000     $ 1,800,000,000    
Maximum [Member] | REA Group [Member]              
Debt Instrument [Line Items]              
Net leverage ratio 325.00% 325.00%     325.00% 325.00%  
Applicable margin for borrowing         1.05%    
Minimum [Member] | REA Group [Member]              
Debt Instrument [Line Items]              
Interest coverage ratio         300.00%    
Applicable margin for borrowing         0.95%    
Facility Due December 2017 [Member] | REA Group [Member]              
Debt Instrument [Line Items]              
Repayment of revolving credit facility     $ 93,000,000 $ 120      
Amounts drawn under credit facility       $ 480   $ 70  
Credit Agreement maturity     2017-12 2017-12      
Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Unsecured revolving credit facility available amount $ 650,000,000 $ 650,000,000     $ 650,000,000    
Letters of credit sublimit under credit facility 100,000,000 100,000,000     100,000,000    
Maximum amount of credit facility $ 900,000,000 900,000,000     $ 900,000,000    
Credit Agreement due date         Oct. 23, 2020    
Interest on borrowings, description         Either (a) a Eurodollar Rate formula or (b) the Base Rate formula, each as set forth in the Credit Agreement.    
Commitment fee percentage on undrawn balance 0.225%            
Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Applicable margin for borrowing 0.50%            
Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member] | Eurodollar [Member]              
Debt Instrument [Line Items]              
Applicable margin for borrowing 1.50%            
Credit Agreement [Member] | Maximum [Member] | Unsecured Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Operating income leverage ratio         300.00%    
Credit Agreement [Member] | Maximum [Member] | Unsecured Revolving Credit Facility [Member] | Foxtel [Member]              
Debt Instrument [Line Items]              
Operating income leverage ratio         375.00%    
Credit Agreement [Member] | Minimum [Member] | Unsecured Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Interest coverage ratio         300.00%    
Credit Agreement [Member] | Minimum [Member] | Unsecured Revolving Credit Facility [Member] | Foxtel [Member]              
Debt Instrument [Line Items]              
Interest coverage ratio         350.00%    
Facility Due April 2021 [Member] | Hometrack Australia [Member]              
Debt Instrument [Line Items]              
Draw down on revolving credit facility   $ 53,000,000