Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates, accounted for using the equity method $ 1,750 $ 1,117
Liberty Sirius XM Group    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates, accounted for using the equity method $ 672 164
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 $ 672 164
Braves Group    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates, accounted for using the equity method 145 61
Braves Group | Other    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates, accounted for using the equity method 145 61
Formula One Group    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates, accounted for using the equity method 933 892
Formula One Group | Other    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates, accounted for using the equity method $ 177 161
Formula One Group | Live Nation    
Schedule of Equity Method Investments [Line Items]    
Percentage ownership 34.00%  
Equity Method Investment, Quoted Market Value $ 2,965  
Investments in affiliates, accounted for using the equity method $ 756 $ 731
SIRIUS XM | Sirius XM Canada    
Schedule of Equity Method Investments [Line Items]    
Percentage ownership 70.00%