Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 17, 2016	Jul. 03, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	ON Semiconductor Corporation
Entity Central Index Key	0001097864
Current Fiscal Year End	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2015
Amendment Flag	false
Entity Common Stock, Shares Outstanding		412,095,180
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 4,783,105,387
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No