Annual report pursuant to Section 13 and 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Other Activity) (Details)

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Investments In Affiliates Accounted For Using The Equity Method (Other Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 29, 2017
Feb. 28, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 18, 2016
Schedule of Equity Method Investments [Line Items]            
Investments in and Advances to Affiliates, at Fair Value     $ 3,635 $ 3,161    
HSNi            
Schedule of Equity Method Investments [Line Items]            
Percentage of equity method investee not currently owned 62.00%          
Liberty Broadband            
Schedule of Equity Method Investments [Line Items]            
Investments in and Advances to Affiliates, at Fair Value           $ 2,400
Ownership Interest In Investee           23.50%
TREE variable postpaid forward member            
Schedule of Equity Method Investments [Line Items]            
Unrealized Gain (Loss) on Derivatives     $ (95)      
TREE variable postpaid forward member | Ventures Holdco, LLC            
Schedule of Equity Method Investments [Line Items]            
Derivative, Term of Contract     2 years      
Derivative, Notional Amount     $ 110      
Derivative, number of shares pledged     642,850      
Derivative, value of shares purchased     $ 77      
QVC Group Common Stock | HSNi            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Dividends or Distributions   $ 200 28 28 $ 228  
Dividend Received Per Share From Equity Method Affiliate         $ 10  
Liberty Ventures common stock            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment Other Than Temporary Impairment         $ 98  
Investments in and Advances to Affiliates, at Fair Value     $ 3,635 $ 3,161