Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Details)

v3.10.0.1
Long-Term Debt (Narrative) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 23, 2016
Jun. 15, 2016
Debt Instrument [Line Items]          
Debt Instrument, Call Feature 5 years        
Line of credit facility, maximum borrowing capacity       $ 2,650,000,000  
Derivative notional amount         $ 125,000,000
Derivative Asset, Current $ 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 $ 1,815,000,000        
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 3.70%        
Weighted average interest rate 4.60%        
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  
3.125% Senior Secured Notes due 2019, net of original issue discount          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.125%        
Debt and Capital Lease Obligations $ 399,000,000 $ 399,000,000      
6.375% Senior Secured Notes due 2067          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.375%        
Debt and Capital Lease Obligations $ 225,000,000 $ 0