Quarterly report pursuant to Section 13 or 15(d)

Tracking Stocks (Narrative) (Details)

v3.10.0.1
Tracking Stocks (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jul. 18, 2018
Jun. 30, 2018
Dec. 31, 2017
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   $ 485 $ 1,029
Liberty Sirius XM Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   174  
Braves Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   113  
Formula One Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   198  
SIRIUS XM      
Targeted or Tracking Stock, Stock [Line Items]      
Common Stock, Dividends, Per Share, Declared $ 0.011    
Payments of Dividends   99  
Cash Dividends Paid to Parent Company   70  
SIRIUS XM | Liberty Sirius XM Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   $ 64  
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   $ 89  
Braves Holdings | Braves Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   $ 78