v3.10.0.1
Document And Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2018
Jan. 31, 2019
Jun. 29, 2018
Entity Registrant Name Liberty Media Corp    
Entity Central Index Key 0001560385    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 22.8
Liberty Sirius XM Group Common Class A      
Entity Common Stock, Shares Outstanding   102,809,736  
Liberty Sirius XM Group Common Class B      
Entity Common Stock, Shares Outstanding   9,821,531  
Liberty Sirus XM Group Common Class C      
Entity Common Stock, Shares Outstanding   210,823,353  
Liberty Braves Group Common Class A      
Entity Common Stock, Shares Outstanding   10,244,591  
Liberty Braves Group Common Class B      
Entity Common Stock, Shares Outstanding   981,860  
Liberty Braves Group Common Class C      
Entity Common Stock, Shares Outstanding   39,740,215  
Liberty Formula One Group Common Class A      
Entity Common Stock, Shares Outstanding   25,675,346  
Liberty Formula One Group Common Class B      
Entity Common Stock, Shares Outstanding   2,453,485  
Liberty Formula One Group Common Class C      
Entity Common Stock, Shares Outstanding   202,887,872