Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Revenue recognition - Disaggregation of revenue - SIRIUS XM (Details)

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Summary of Significant Accounting Policies - Revenue recognition - Disaggregation of revenue - SIRIUS XM (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue disaggregated by source                      
Revenue $ 2,619 $ 2,856 $ 2,805 $ 2,012 $ 2,009 $ 2,315 $ 2,199 $ 1,517 $ 10,292 $ 8,040 $ 7,594
Sirius XM Holdings                      
Revenue disaggregated by source                      
Revenue                 $ 7,794 5,771  
Activation fees, recognition period                 1 month    
Sirius XM Holdings | Minimum                      
Revenue disaggregated by source                      
Subscription period                 3 months    
Sirius XM Holdings | Maximum                      
Revenue disaggregated by source                      
Subscription period                 12 months    
Sirius XM Holdings | Subscriber                      
Revenue disaggregated by source                      
Revenue                 $ 6,120 5,264  
Sirius XM Holdings | Advertising                      
Revenue disaggregated by source                      
Revenue                 1,336 188  
Sirius XM Holdings | Equipment                      
Revenue disaggregated by source                      
Revenue                 173 155  
Sirius XM Holdings | Other                      
Revenue disaggregated by source                      
Revenue                 $ 165 $ 164