v3.8.0.1
Document And Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2017
Jan. 31, 2018
Jun. 30, 2017
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, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Public Float     $ 22.2
Liberty Sirius XM Group Common Class A      
Entity Common Stock, Shares Outstanding   102,710,302  
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   223,619,199  
Liberty Braves Group Common Class A      
Entity Common Stock, Shares Outstanding   10,243,193  
Liberty Braves Group Common Class B      
Entity Common Stock, Shares Outstanding   981,860  
Liberty Braves Group Common Class C      
Entity Common Stock, Shares Outstanding   39,723,308  
Liberty Formula One Group Common Class A      
Entity Common Stock, Shares Outstanding   25,649,445  
Liberty Formula One Group Common Class B      
Entity Common Stock, Shares Outstanding   2,454,448  
Liberty Formula One Group Common Class C      
Entity Common Stock, Shares Outstanding   202,720,256