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Information about QVC's Operating Segments (Total Assets and Capital Expenditures by Segment) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Total assets $ 16,340 $ 16,558
Capital expenditures 145  
Property and equipment, net of accumulated depreciation of $1,457 at September 30, 2021 and $1,544 at December 31, 2020 1,086 $ 1,178
QxH [Member]    
Segment Reporting Information [Line Items]    
Total assets 14,073  
Capital expenditures 124  
Property and equipment, net of accumulated depreciation of $1,457 at September 30, 2021 and $1,544 at December 31, 2020 720  
QVC-International    
Segment Reporting Information [Line Items]    
Total assets 2,267  
Capital expenditures 21  
Property and equipment, net of accumulated depreciation of $1,457 at September 30, 2021 and $1,544 at December 31, 2020 $ 366