Quarterly report pursuant to Section 13 or 15(d)

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

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Investments In Affiliates Accounted For Using The Equity Method (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
May 25, 2017
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method $ 1,730 $ 1,750  
Liberty Sirius XM Group      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method $ 661 672  
Liberty Sirius XM Group | Sirius XM Canada      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 70.00%    
Investments in affiliates, accounted for using the equity method $ 650 672  
Liberty Sirius XM Group | Other      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method 11    
Braves Group      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method 97 145  
Braves Group | Other      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method 97 145  
Formula One Group      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method 972 933  
Formula One Group | Other      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates, accounted for using the equity method $ 171 177  
Formula One Group | Live Nation      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 34.00%    
Equity Method Investment, Quoted Market Value $ 3,794    
Investments in affiliates, accounted for using the equity method $ 801 $ 756  
SIRIUS XM | Sirius XM Canada      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership     70.00%