Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Fair Value of Debt (Details)

v3.21.1
Long-Term Debt - Fair Value of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Long-term debt, measured at fair value $ 3,998 $ 3,861
Liberty SiriusXM Group | Sirius XM 3.875% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 3.875%  
Long-term debt, measured at fair value $ 1,004  
Liberty SiriusXM Group | Sirius Xm 4.625% Senior Notes Due 2024    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 4.625%  
Long-term debt, measured at fair value $ 1,543  
Liberty SiriusXM Group | Sirius XM 5.375% Senior Notes due 2026    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 5.375%  
Long-term debt, measured at fair value $ 1,032  
Liberty SiriusXM Group | Sirius XM 5.0% Senior Notes due 2027    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 5.00%  
Long-term debt, measured at fair value $ 1,567  
Liberty SiriusXM Group | Sirius Xm 5.50% Senior Notes Due 2029    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 5.50%  
Long-term debt, measured at fair value $ 1,352  
Liberty SiriusXM Group | Sirius XM 4.125% Senior Notes Due 2030    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 4.125%  
Long-term debt, measured at fair value $ 1,500  
Liberty SiriusXM Group | Pandora 1.75% Convertible Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt instrument interest rate (as a percent) 1.75%  
Long-term debt, measured at fair value $ 224