Long-Term Debt - Debt Securities That Are Not Reported At Fair Value (Details) $ in Millions	Mar. 31, 2019 USD ($)
Senior Debentures
Long-term debt
Fair value of debt securities that are not reported at fair value	$ 809
QVC \| QVC Senior Secured Notes
Long-term debt
Fair value of debt securities that are not reported at fair value	$ 3,802

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