Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v2.4.1.9
Commitments and Contingencies - Additional Information (Details) (USD $)
 3 Months Ended 1 Months Ended
Mar. 31, 2015
Aug. 31, 2013
Sep. 30, 2013
claim
Loss Contingencies [Line Items]      
Agreement term to repurchase certain products shipped to distributor from date of shipment (after 90 days) 90 days    
Pre-1972 Recording Matters [Member] | Pending Litigation [Member]      
Loss Contingencies [Line Items]      
Number of pending claims   3us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= siri_PreNineteenSeventyTwoRecordingMattersMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		1us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= siri_PreNineteenSeventyTwoRecordingMattersMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
Compensatory damages sought 100,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= siri_PreNineteenSeventyTwoRecordingMattersMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		   
Telephone Consumer Protection Act Suits [Member] | Pending Litigation [Member]      
Loss Contingencies [Line Items]      
Statutory damages sought per violation 500siri_LossContingencyDamagesSoughtValuePerViolation
/ us-gaap_LitigationCaseAxis
= siri_TelephoneConsumerProtectionActSuitsMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember 		   
Maximum [Member]      
Loss Contingencies [Line Items]      
Operating lease obligations, term 15 years    
Maximum [Member] | Sound Exchange, Inc | Pending Litigation [Member]      
Loss Contingencies [Line Items]      
Compensatory damages sought   100,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= siri_SoundExchangeIncMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		 
Maximum [Member] | Telephone Consumer Protection Act Suits [Member] | Pending Litigation [Member]      
Loss Contingencies [Line Items]      
Treble damages sought per willful violation 1,500siri_LossContingencyDamagesSoughtValuePerWillfulViolation
/ us-gaap_LitigationCaseAxis
= siri_TelephoneConsumerProtectionActSuitsMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		   
Minimum [Member]      
Loss Contingencies [Line Items]      
Operating lease obligations, term 1 year    
Minimum [Member] | Sound Exchange, Inc | Pending Litigation [Member]      
Loss Contingencies [Line Items]      
Compensatory damages sought   50,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= siri_SoundExchangeIncMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		 
XM-5, FM-5, FM-6, XM-3, and XM-4 [Member]      
Loss Contingencies [Line Items]      
Operating performance over design life 15 years    
XM-4 [Member]      
Loss Contingencies [Line Items]      
Period beyond expected operating performance of design life for XM-4 5 years    
XM-4 [Member] | Maximum [Member]      
Loss Contingencies [Line Items]      
Additional payments required if XM-4 continues to operate above baseline specifications 10,000,000siri_AdditionalExpenseIncurredIfBaselineSpecificationsAreExceeded
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= siri_XmFourSatelliteMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember