Annual report pursuant to Section 13 and 15(d)

Cover Page

v3.20.4
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 29, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 6,902,732,943
Entity Common Stock, Shares Outstanding   4,139,978,947  
Documents Incorporated by Reference Information included in our definitive proxy statement for our 2021 annual meeting of stockholders scheduled to be held on Thursday, June 3, 2021 is incorporated by reference into Items 10, 11, 12, 13 and 14 of Part III of this report.    
Entity Central Index Key 0000908937    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false