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Background and Basis of Presentation	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Note 1: Background and Basis of Presentation ON Semiconductor Corporation, together with its wholly and majority-owned subsidiaries (the "Company"), prepares its consolidated financial statements in accordance with GAAP. As of December 31, 2020, the Company was organized into three operating segments, which also represent its three reportable segments: PSG, ASG and ISG. Additional information about the Company's operating and reportable segments is included in Note 3: ''Revenue and Segment Information''. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in the context of the information reasonably available as of December 31, 2020, and through the filing date of this Form 10-K. The accounting matters assessed included, but were not limited to, the allowance for doubtful accounts, share-based compensation, inventory valuation, carrying value of indefinite-lived intangible assets, other long-lived assets and goodwill, valuation allowance for tax assets, contingencies and revenue recognition. Future assessment of the current expectations, including of the magnitude and duration of the COVID-19 pandemic, as well as other factors, could result in a material adverse impact to the consolidated financial statements in future reporting periods. Unless otherwise noted, all dollar amounts are in millions, except per share amounts.

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- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-URI http://asc.fasb.org/topic&trid=2122149

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-URI http://asc.fasb.org/topic&trid=2197479

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