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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Adjusted OIBDA Excluding Transaction Related Costs	$ 512	$ 452	$ 1,409	$ 1,406
Transaction related costs	0	0	0	(1)
Stock-based compensation	(10)	(10)	(26)	(30)
Depreciation and amortization	(114)	(112)	(344)	(354)
Operating Income (Loss)	388	330	1,039	1,021
Equity in earnings (losses) of investee	1	0	(1)	(1)
Gain (Loss) on Derivative Instruments, Net, Pretax	1	(2)	(3)	(5)
Interest expense, net	(65)	(61)	(194)	(182)
Foreign currency gain (loss)	1	0	3	(3)
Income before income taxes	284	267	802	830
Gain (Loss) on Extinguishment of Debt	$ (42)	$ 0	$ (42)	$ 0