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Information about QVC's Operating Segments (Reconciliation of Adjusted OIBDA to Income before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting [Abstract]      
Adjusted OIBDA $ 1,897 $ 1,840 $ 1,894
Stock-based compensation (31) (32) (31)
Depreciation and amortization (519) (605) (588)
Equity in losses of investee (3) (6) (9)
Gains on financial instruments 0 2 0
Interest expense, net (214) (210) (208)
Foreign currency (loss) gain (6) 38 14
Loss on extinguishment of debt 0 0 (21)
Income before income taxes $ 1,124 $ 1,027 $ 1,051