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Subsequent Events (Details) (Senior Revolving Credit Facility [Member], Semiconductor Components Industries, LLC [Member], USD $)
 0 Months Ended
May 01, 2015
Oct. 10, 2013
Subsequent Event [Line Items]    
Line of credit, maximum borrowing capacity   $ 800,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Subsequent Event [Member]
    
Subsequent Event [Line Items]    
Line of credit, maximum borrowing capacity 1,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= onnn_SemiconductorComponentsIndustriesLLCMember
/ us-gaap_LongtermDebtTypeAxis
= onnn_SeniorRevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Revolving Credit Facility [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Line of credit term 5 years