| Long-Term Debt - Debt Securities That Are Not Reported At Fair Value (Details) $ in Millions | Jun. 30, 2021  USD ($) | 
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| Senior Debentures | |
| Long-term debt | |
| Fair value of debt securities that are not reported at fair value | $ 908 | 
| QVC Senior Secured Notes | |
| Long-term debt | |
| Fair value of debt securities that are not reported at fair value | $ 4,708 | 
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- Definition Fair value of debt securities that are note reported at fair value No definition available. 
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