Quarterly report pursuant to Section 13 or 15(d)

Tracking Stocks (Narrative) (Details)

v3.8.0.1
Tracking Stocks (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
Apr. 26, 2018
Feb. 28, 2018
Mar. 31, 2018
Dec. 31, 2017
Targeted or Tracking Stock, Stock [Line Items]        
Cash and cash equivalents     $ 1,042 $ 1,029
Liberty Sirius XM Group        
Targeted or Tracking Stock, Stock [Line Items]        
Cash and cash equivalents     658  
Braves Group        
Targeted or Tracking Stock, Stock [Line Items]        
Cash and cash equivalents     114  
Formula One Group        
Targeted or Tracking Stock, Stock [Line Items]        
Cash and cash equivalents     270  
SIRIUS XM        
Targeted or Tracking Stock, Stock [Line Items]        
Common Stock, Dividends, Per Share, Declared $ 0.011      
Payments of Dividends   $ 49    
Cash Dividends Paid to Parent Company   $ 35    
SIRIUS XM | Liberty Sirius XM Group        
Targeted or Tracking Stock, Stock [Line Items]        
Cash and cash equivalents     $ 79  
Formula 1 | Braves Group        
Targeted or Tracking Stock, Stock [Line Items]        
Percentage ownership     15.10%  
Investment Owned, Balance, Shares     9,084,940  
Formula 1 | Braves Group | Common Class C        
Targeted or Tracking Stock, Stock [Line Items]        
Investment Owned, Balance, Shares     9,084,940  
Formula 1 | Formula One Group        
Targeted or Tracking Stock, Stock [Line Items]        
Cash and cash equivalents     $ 140