XML 11 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Cover Page - shares
 9 Months Ended
Oct. 01, 2021
Oct. 27, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Oct. 01, 2021  
Document Transition Report false  
Entity File Number 001-39317  
Entity Registrant Name ON SEMICONDUCTOR CORP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 36-3840979  
Entity Address, Address Line One 5005 E. McDowell Road  
Entity Address, City or Town Phoenix  
Entity Address, State or Province AZ  
Entity Address, Postal Zip Code 85008  
City Area Code 602  
Local Phone Number 244-6600  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol ON  
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   430,833,656
Entity Central Index Key 0001097864  
Current Fiscal Year End --12-31  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Amendment Flag false