Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Details)

v3.8.0.1
Long-Term Debt (Narrative) (Details) - USD ($)
Sep. 30, 2017
Sep. 30, 2016
Jun. 23, 2016
Jun. 15, 2016
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 2,650,000,000  
Derivative notional amount       $ 125,000,000
Derivative asset noncurrent $ 2,000,000      
Line of credit facility, standby letter of credit     300,000,000  
Line of credit facility, uncommitted loan     1,500,000,000  
Line of credit facility, remaining borrowing capacity $ 950,000,000      
Debt instrument, lower range of basis spread on variable rate   0.25%    
Debt instrument, higher range of basis spread on variable rate   0.75%    
Line of credit facility, interest rate at period end 2.70%      
Weighted average interest rate 4.10%      
London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, lower range of basis spread on variable rate   1.25%    
Debt instrument, higher range of basis spread on variable rate   1.75%    
Revolving Credit Facility | Tranche One, Shared with Related Party        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     400,000,000  
Revolving Credit Facility | QVC        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     2,250,000,000  
Revolving Credit Facility | QVC Portion Maturing on March 9, 2020 [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     140,000,000  
Standby Letters of Credit | Tranche One, Shared with Related Party        
Debt Instrument [Line Items]        
Line of credit facility, standby letter of credit     $ 50,000,000