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Liberty Expedia Holdings Transaction - Narrative (Details) - USD ($)
shares in Millions
3 Months Ended 9 Months Ended
Jul. 26, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Aug. 26, 2019
Dec. 31, 2018
Asset Acquisition [Line Items]              
Long-term debt   $ 4,919,000,000   $ 4,919,000,000     $ 3,717,000,000
Share repurchase consideration   300,000,000 $ 193,000,000 300,000,000 $ 602,000,000    
Stock issued during period, period increase (decrease) (3.1)            
Goodwill   8,104,000,000   8,104,000,000     $ 8,120,000,000
Liberty Expedia Holdings              
Asset Acquisition [Line Items]              
Liberty Expedia Holdings transaction, value of shares issued $ 2,900,000,000            
Cash payment for consideration 15,000,000            
Share repurchase consideration   3,200,000,000          
Exchangeable Senior Debentures due 2047 | Exchangeable Debentures | Liberty Expedia Holdings              
Asset Acquisition [Line Items]              
Long-term debt $ 400,000,000         $ 401,000,000  
Debt, interest rate (percentage) 1.00%            
Bodybuilding.com              
Asset Acquisition [Line Items]              
Fair value of the assets and liabilities acquired in the business combination $ 91,000,000            
Business combination, recognized identifiable assets acquired and liabilities assumed, cash 78,000,000            
Goodwill 0            
Business combination, pro forma information, revenue of acquiree since acquisition date, actual   24,000,000   24,000,000      
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual   $ 3,000,000   $ 3,000,000      
Trade Names | Bodybuilding.com              
Asset Acquisition [Line Items]              
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangible assets $ 10,000,000