Quarterly report pursuant to Section 13 or 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
3 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
May 25, 2017
CAD ($)
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2018
USD ($)
May 25, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]              
Deferred revenue     $ 2,463   $ 1,941 $ 1,899  
Repayments of debt     1,154 $ 1,154      
SIRIUS XM              
Schedule of Equity Method Investments [Line Items]              
Due to Related Parties, Current     4        
Due to Related Parties, Noncurrent     7        
Due from Related Parties, Current     13        
Cash Dividends Paid to Parent Company $ 35            
SIRIUS XM | Sirius XM Canada              
Schedule of Equity Method Investments [Line Items]              
Revenue from Related Parties     $ 24 12      
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, Period Of Agreement   30 years          
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          
Sirius XM Canada              
Schedule of Equity Method Investments [Line Items]              
Cash Dividends Paid to Parent Company     $ 1 $ 4      
Sirius XM Canada | Related Party 7.62% Loan              
Schedule of Equity Method Investments [Line Items]              
Repayments of debt     $ 3