Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Debt Securities That Are Not Reported At Fair Value) (Details)

v3.10.0.1
Long-Term Debt (Debt Securities That Are Not Reported At Fair Value) (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Senior Debentures  
Debt Instrument [Line Items]  
Fair Value of Debt Securities That Are Not Reported at Fair Value $ 850
QVC Senior Secured Notes  
Debt Instrument [Line Items]  
Fair Value of Debt Securities That Are Not Reported at Fair Value $ 3,666