Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt and Equity Securities - Summary (Details)

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Investments in Debt and Equity Securities - Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investments in Debt and Equity Securities    
Consolidated Liberty $ 787 $ 1,278
Liberty Sirius XM Group    
Investments in Debt and Equity Securities    
Debt securities 456 967
Consolidated Liberty 456  
Liberty Sirius XM Group | Pandora | Debt Securities    
Investments in Debt and Equity Securities    
Debt securities   523
Liberty Sirius XM Group | iHeart | Debt Securities    
Investments in Debt and Equity Securities    
Debt securities 456 444
Braves Group    
Investments in Debt and Equity Securities    
Other equity securities 8 8
Consolidated Liberty 8  
Braves Group | Other Equity Securities | Equity Securities    
Investments in Debt and Equity Securities    
Other equity securities 8 8
Formula One Group    
Investments in Debt and Equity Securities    
Other equity securities 323 303
Consolidated Liberty 323  
Formula One Group | AT&T | Equity Securities    
Investments in Debt and Equity Securities    
Equity securities 192 174
Formula One Group | Other Equity Securities | Equity Securities    
Investments in Debt and Equity Securities    
Other equity securities $ 131 $ 129