Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
 6 Months Ended
Jun. 30, 2021
Jul. 23, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2021  
Document Transition Report false  
Entity File Number 001-34295  
Entity Registrant Name SIRIUS XM HOLDINGS INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 38-3916511  
Entity Address, Address Line One 1221 Avenue of the Americas  
Entity Address, Address Line Two 35th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10020  
City Area Code 212  
Local Phone Number 584-5100  
Title of 12(b) Security Common stock, $0.001 par value  
Trading Symbol SIRI  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   4,050,435,824
Entity Central Index Key 0000908937  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Current Fiscal Year End Date --12-31