Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Details)

v3.21.1
Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 01, 2019
Debt Instrument [Line Items]        
Line of Credit Facility, Remaining Borrowing Capacity $ 2,850      
Derivative, Notional Amount       $ 125
Derivative Asset, Current $ 2 $ 3    
Debt Instrument, Lower Range of Basis Spread on Variable Rate 0.25%      
Debt Instrument, Higher Range of Basis Spread on Variable Rate 0.75%      
Debt, Weighted Average Interest Rate 4.90%      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,950  
Line of Credit Facility, Standby Letter of Credit     450  
Line of credit facility, uncommitted loan     1,500  
Tranche One, Shared with Related Party | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 400   400  
Tranche One, Shared with Related Party | Standby Letters of Credit        
Debt Instrument [Line Items]        
Line of Credit Facility, Standby Letter of Credit     50  
QVC | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,550  
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%      
6.375% Senior Secured Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.375%      
6.25% Senior Secured Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.25%