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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting [Abstract]        
Adjusted OIBDA $ 417 $ 415 $ 1,305 $ 1,317
Transaction related costs (28) (3) (32) (3)
Stock-based compensation (10) (9) (30) (23)
Depreciation and amortization (78) (129) (229) (440)
Equity in losses of investee (1) 0 (2) (3)
Interest expense, net (57) (54) (172) (165)
Foreign currency (loss) gain (1) 4 0 (6)
Income before income taxes $ 242 $ 224 $ 840 $ 677