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Information about QVC's Operating Segments (Reconciliation of Adjusted OIBDA to Income before Income Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting [Abstract]    
Adjusted OIBDA $ 434 $ 415
Stock-based compensation (6) (6)
Depreciation and amortization (157) (148)
Equity in losses of investee (2) (1)
Interest expense, net (55) (53)
Foreign currency (loss) gain (2) 2
Income before income taxes $ 212 $ 209