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Related Party Transactions - Additional Information 2 (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 25, 2014
Dec. 31, 2014
Oct. 09, 2013
Related Party Transaction [Line Items]          
Stock repurchased during period, value $ 534,040,000siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram $ 128,682,000siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram      
Loss on change in value of derivatives 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax 27,023,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax      
Interest expense associated with debt 69,908,000us-gaap_InterestExpense 54,092,000us-gaap_InterestExpense      
Current portion of deferred revenue 1,668,484,000us-gaap_DeferredRevenueCurrent     1,632,381,000us-gaap_DeferredRevenueCurrent  
Deferred revenue, Noncurrent 156,102,000us-gaap_DeferredRevenueNoncurrent     151,901,000us-gaap_DeferredRevenueNoncurrent  
Common Stock [Member]          
Related Party Transaction [Line Items]          
Stock repurchased during period, value 0siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Liberty Media [Member]          
Related Party Transaction [Line Items]          
Loss on change in value of derivatives   27,023,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_LibertyMediaMember
     
Liberty Media [Member] | 7% Exchangeable Senior Subordinated Notes due 2014 [Member]          
Related Party Transaction [Line Items]          
Interest expense associated with debt   277,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= siri_SevenPercentExchangeableSeniorSubordinatedNotesDueTwoThousandFourteenMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_LibertyMediaMember
     
Liberty Media [Member] | Common Stock [Member] | October 2013 Share Repurchase Program [Member]          
Related Party Transaction [Line Items]          
Stock repurchase program, authorized amount         500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_LibertyMediaMember
/ us-gaap_ShareRepurchaseProgramAxis
= siri_October2013ShareRepurchaseProgramMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Stock repurchased during period, value     340,000,000siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_LibertyMediaMember
/ us-gaap_ShareRepurchaseProgramAxis
= siri_October2013ShareRepurchaseProgramMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Share price (in dollars per share)     $ 3.66us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_LibertyMediaMember
/ us-gaap_ShareRepurchaseProgramAxis
= siri_October2013ShareRepurchaseProgramMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Sirius XM Canada [Member]          
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 36.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
       
Equity Method Investment, Voting Interest 24.90%siri_EquityMethodInvestmentVotingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
       
Current portion of deferred revenue 2,776,000us-gaap_DeferredRevenueCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
    2,776,000us-gaap_DeferredRevenueCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
 
Deferred revenue, Noncurrent 12,721,000us-gaap_DeferredRevenueNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
    13,415,000us-gaap_DeferredRevenueNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
 
Off balance sheet equity method loss 6,946,000siri_OffBalanceSheetEquityMethodLoss
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
       
Investment balance $ 0us-gaap_EquityMethodInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
    $ 2,654,000us-gaap_EquityMethodInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
 
Sirius XM Canada [Member] | Related Party Class A Stock [Member]          
Related Party Transaction [Line Items]          
Sirius XM Canada Class A shares owned on a converted basis (in shares) 47.3siri_EquityMethodInvestmentNumberOfShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= siri_SiriusXmCanadaMember
/ us-gaap_StatementClassOfStockAxis
= siri_RelatedPartyClassAStockMember