Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Long-Term Debt - Fair Value of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Long-term debt, measured at fair value $ 3,237   $ 3,678  
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%     3.875%
Long-term debt, measured at fair value $ 1,007      
Liberty SiriusXM Group | Sirius XM 4.625% Senior Notes Due 2023        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Debt instrument interest rate (as a percent)       4.625%
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 $ 1,551      
Liberty SiriusXM Group | Sirius XM 5.375% Senior Notes Due 2025        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Debt instrument interest rate (as a percent)       5.375%
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 $ 1,044      
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 $ 1,569      
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 $ 1,342      
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% 4.125%    
Long-term debt, measured at fair value $ 1,528      
Liberty SiriusXM Group | Pandora 1.75% Convertible Senior Notes due 2020        
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 $ 1      
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 $ 212