| Document and Entity Information | Feb. 07, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | ON SEMICONDUCTOR CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0001097864 |
| Document Type | 8-K |
| Document Period End Date | Feb. 7, 2022 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39317 |
| Entity Tax Identification Number | 36-3840979 |
| Entity Address, Address Line One | ON Semiconductor Corporation |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | ON |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
