Long-Term Debt - Debt Securities That Are Not Reported At Fair Value (Details) $ in Millions |
Sep. 30, 2020
USD ($)
|
|---|---|
| Senior Debentures | |
| Long-term debt | |
| Fair value of debt securities that are not reported at fair value | $ 846 |
| QVC | QVC Senior Secured Notes | |
| Long-term debt | |
| Fair value of debt securities that are not reported at fair value | $ 4,481 |
| QVC | QVC 6.375% Senior Secured Notes Due 2067 | |
| Long-term debt | |
| Interest rate (as a percent) | 6.375% |
| QVC | QVC 6.25% Senior Secured Notes Due 2068 | |
| Long-term debt | |
| Interest rate (as a percent) | 6.25% |