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Description of Business and Basis of presentation (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 01, 2018
Apr. 30, 2018
Sep. 30, 2018
Jun. 30, 2018
Revenue reclassifications     $ 12 $ 57
New Foxtel [Member]        
Ownership interest   65.00%    
Accounting Standards Update 2014-09 [Member]        
Adjustment to retained earnings $ 20      
Accounting Standards Update 2016-01 [Member]        
Adjustment to retained earnings $ 22      
FOX SPORTS Australia [Member] | New Foxtel [Member]        
Company ownership percentage   100.00%    
Telstra [Member] | New Foxtel [Member]        
Ownership interest held by minority interest   35.00%    
Foxtel [Member] | New Foxtel [Member]        
Equity method investment, ownership percentage   50.00%