Annual report pursuant to Section 13 and 15(d)

Investments In Affiliates Accounted For Using The Equity Method - Sirius XM Canada (Details)

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Investments In Affiliates Accounted For Using The Equity Method - Sirius XM Canada (Details)
shares in Millions, $ in Millions, $ in Millions
12 Months Ended
May 25, 2017
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Jan. 01, 2018
USD ($)
May 25, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]            
Gain (Loss) On Dilution Of Investment In Affiliate   $ (1) $ 3      
Deferred revenue   2,079 1,941   $ 1,899  
Repayments of debt   4,057 5,107 $ 1,749    
SIRIUS XM            
Schedule of Equity Method Investments [Line Items]            
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees     130      
SIRIUS XM | Sirius XM Canada            
Schedule of Equity Method Investments [Line Items]            
Due to Related Parties   9 10      
Due from Related Parties, Current   11 10      
Revenue from Related Parties   97 87 46    
SIRIUS XM | Sirius XM Canada            
Schedule of Equity Method Investments [Line Items]            
Proceeds from Equity Method Investment, Dividends or Distributions   $ 2 4 $ 8    
Percentage ownership   70.00%        
Equity Method Investment Voting Interest   33.00%        
Payments to Acquire Equity Method Investments     130      
Equity method investment consideration transferred     $ 309      
Issuance of common stock related to investment in Sirius XM Canada (in shares) | shares     35      
Equity method investment, consideration transferred, equity interests issued and issuable     $ 179      
SIRIUS XM | Sirius XM Canada | Services Agreement            
Schedule of Equity Method Investments [Line Items]            
Related Party Transaction, Period Of Agreement 30 years          
SIRIUS XM | Sirius XM Canada | Services Agreement, Years 1 through 5            
Schedule of Equity Method Investments [Line Items]            
Related Party Transaction, Payments Receivable, Percent of Gross Revenue 25.00%          
SIRIUS XM | Sirius XM Canada | Services Agreement, Years 6 through 30            
Schedule of Equity Method Investments [Line Items]            
Related Party Transaction, Payments Receivable, Percent of Gross Revenue 30.00%          
SIRIUS XM | Sirius XM Canada | Advisory Services Agreement            
Schedule of Equity Method Investments [Line Items]            
Related Party Transaction, Payments Receivable, Percent of Gross Revenue 5.00%          
SIRIUS XM | Sirius XM Canada | Related Party 7.62% Loan            
Schedule of Equity Method Investments [Line Items]            
Notes Receivable, Related Parties, Noncurrent           $ 131
Notes receivable, related parties, maturity period 15 years          
Related Party Transaction, Rate 7.62%          
Notes Receivable, Related Parties, Annual Principal Repayment Period 60 days          
Notes Receivable, Related Parties, Annual Prepayment Excess Cash Threshold $ 10