v3.3.1.900
Document and Entity Information - shares
6 Months Ended
Dec. 31, 2015
Feb. 03, 2016
Document And Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2015  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2  
Entity Registrant Name TWENTY-FIRST CENTURY FOX, INC.  
Entity Central Index Key 0001308161  
Current Fiscal Year End Date --06-30  
Entity Filer Category Large Accelerated Filer  
Class A Common Stock    
Document And Entity Information [Line Items]    
Trading Symbol FOXA  
Entity Common Stock, Shares Outstanding   1,119,446,970
Class B Common Stock    
Document And Entity Information [Line Items]    
Trading Symbol FOX  
Entity Common Stock, Shares Outstanding   798,520,953