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, CAD in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
May 25, 2017
CAD
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
May 25, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]            
Gain (Loss) On Dilution Of Investment In Affiliate     $ 3   $ (1)  
Deferred revenue $ 1,941   1,941 $ 1,877    
SIRIUS XM            
Schedule of Equity Method Investments [Line Items]            
Cash Dividends Paid to Parent Company     130      
SIRIUS XM | Sirius XM Canada            
Schedule of Equity Method Investments [Line Items]            
Due to Related Parties 10   10 11    
Due from Related Parties, Current $ 10   10 6    
Revenue from Related Parties     87 46 56  
SIRIUS XM | Sirius XM Canada            
Schedule of Equity Method Investments [Line Items]            
Proceeds from Equity Method Investment, Dividends or Distributions     $ 4 $ 8 $ 16  
Percentage ownership 70.00%   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      
Equity Method Investment, Number of Preferred Shares Owned | shares     591      
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 | CAD   CAD 10