Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2017
Oct. 23, 2017
Document And Entity Information [Abstract]    
Entity Registrant Name SIRIUS XM HOLDINGS INC.  
Entity Central Index Key 0000908937  
Trading Symbol SIRI  
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   4,595,820,002