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Information about QVC's Operating Segments (Long-lived Assets by Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Property and equipment, net $ 1,005 $ 1,031
QVC-U.S.    
Segment Reporting Information [Line Items]    
Property and equipment, net 559 594
QVC-International    
Segment Reporting Information [Line Items]    
Property and equipment, net $ 446 $ 437