Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narrative) (Details)

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Stockholders' Equity (Narrative) (Details) - shares
Sep. 30, 2017
Dec. 31, 2016
Common Class A | QVC Group Common Stock    
Class of Stock [Line Items]    
Common stock, shares authorized 4,000,000,000 4,000,000,000
Common Stock, Shares, Issued 408,826,790 429,005,932
Common Stock, Shares, Outstanding 408,826,790 429,005,932
Common Class A | Liberty Ventures common stock    
Class of Stock [Line Items]    
Common stock, shares authorized 400,000,000 400,000,000
Common Stock, Shares, Issued 81,351,302 81,150,711
Common Stock, Shares, Outstanding 81,351,302 81,150,711
Common Class B | QVC Group Common Stock    
Class of Stock [Line Items]    
Common stock, shares authorized 150,000,000 150,000,000
Common Stock, Shares, Issued 29,217,195 29,358,638
Common Stock, Shares, Outstanding 29,217,195 29,358,638
Common Class B | Liberty Ventures common stock    
Class of Stock [Line Items]    
Common stock, shares authorized 15,000,000 15,000,000
Common Stock, Shares, Issued 4,245,314 4,271,958
Common Stock, Shares, Outstanding 4,245,314 4,271,958
Common Class C | QVC Group Common Stock    
Class of Stock [Line Items]    
Common stock, shares authorized 4,000,000,000  
Common Stock, Shares, Issued 0  
Common Stock, Shares, Outstanding 0  
Common Class C | Liberty Ventures common stock    
Class of Stock [Line Items]    
Common stock, shares authorized 400,000,000  
Common Stock, Shares, Issued 0  
Common Stock, Shares, Outstanding 0