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Background and Basis of Presentation	12 Months Ended
Background and Basis of Presentation	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Note 1: Background and Basis of Presentation ON Semiconductor Corporation, with its wholly and majority-owned subsidiaries ("onsemi" or the "Company"), operates under the onsemiTM brand, and prepares its consolidated financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP"). Certain reclassifications within the statements of cash flows have been made to prior period amounts to conform to current period presentation. The Company is organized into three operating and reportable segments: the Power Solutions Group ("PSG"), the Analog and Mixed-Signal Group ("AMG") and the Intelligent Sensing Group ("ISG"). During the first quarter of 2024, onsemi reorganized the existing divisions within certain of its operating and reportable segments and renamed the Advanced Solutions Group ("ASG") reportable segment to AMG. See Note 3: ''Segments and Revenue'' for additional information regarding the segment reorganization. Unless otherwise noted, all dollar amounts are in millions, except per share amounts.