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Description of Business and Basis of presentation (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 02, 2018
Apr. 30, 2018
Mar. 31, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Type of Revenue [Extensible List]       us-gaap:AdvertisingMember      
Fiscal period duration           364 days  
Scenario, Forecast [Member]              
Fiscal period duration         364 days    
Advertising [Member]              
Revenue reclassifications     $ 15 $ 42   $ 57  
Other [Member]              
Revenue reclassifications     $ (15) $ (42)   $ (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]              
Company ownership percentage   100.00%          
Telstra [Member] | New Foxtel [Member]              
Ownership interest held by minority interest             35.00%
Foxtel [Member]              
Equity method investment, ownership percentage   50.00%