Annual report pursuant to Section 13 and 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Summary of Share Earnings (Losses) of Affiliates) (Details)

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Investments In Affiliates Accounted For Using The Equity Method (Summary of Share Earnings (Losses) of Affiliates) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net $ (200) $ (68) $ (178)
QVC Group Common Stock      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net 38 42 55
QVC Group Common Stock | HSNi      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net 40 48 64
QVC Group Common Stock | Other      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (2) (6) (9)
Liberty Ventures common stock      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (238) (110) (233)
Liberty Ventures common stock | FTD      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (146) (41) (83)
Liberty Ventures common stock | LendingTree      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net 7 12 2
Liberty Ventures common stock | Other      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net $ (99) $ (81) $ (152)