Annual report pursuant to Section 13 and 15(d)

Debt - Fair Value of Debt (Details)

v3.20.4
Debt - Fair Value of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jul. 31, 2019
Jun. 30, 2019
Jul. 31, 2017
May 31, 2016
Mar. 31, 2016
May 13, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis                  
Long-term debt, measured at fair value $ 3,861   $ 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 $ 1,011                
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%     4.625%         4.625%
Long-term debt, measured at fair value $ 1,553                
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%           5.375% 5.375%  
Long-term debt, measured at fair value $ 1,043                
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 $ 1,584                
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%       5.50%        
Long-term debt, measured at fair value $ 1,370                
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 $ 1,584                
Liberty SiriusXM Group | Pandora 1.75% 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 $ 216