Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 29, 2017
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (note 9) $ (14) $ (27)  
HSNi      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (note 9)   16  
FTD      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (note 9) (8) (5)  
LendingTree      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (note 9)   2  
Other      
Schedule of Equity Method Investments [Line Items]      
Share of earnings (losses) of affiliates, net (note 9) $ (6) $ (40)  
HSNi      
Schedule of Equity Method Investments [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired     62.00%