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
9 Months Ended
Oct. 09, 2018
Sep. 30, 2018
Dec. 31, 2017
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   $ 355 $ 1,029
Liberty Sirius XM Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   126  
Braves Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   78  
Formula One Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   151  
SIRIUS XM      
Targeted or Tracking Stock, Stock [Line Items]      
Common Stock, Dividends, Per Share, Declared $ 0.0121    
Payments of Dividends   148  
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees   104  
SIRIUS XM | Liberty Sirius XM Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   $ 46  
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   $ 45  
Braves Holdings | Braves Group      
Targeted or Tracking Stock, Stock [Line Items]      
Cash and cash equivalents   $ 44