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General (Policies)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Schneider National, Inc. and its subsidiaries (together “Schneider,” the “Company,” “we,” “us,” or “our”) are among the largest providers of surface transportation and logistics solutions in North America. We offer a multimodal portfolio of services and an array of capabilities and resources that leverage artificial intelligence, data science, and analytics to provide innovative solutions that coordinate the timely, safe, and efficient movement of customer products. The Company offers truckload, intermodal, and logistics services to a diverse customer base throughout the continental U.S., Canada, and Mexico.
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in conformity with GAAP and the rules and regulations of the SEC applicable to quarterly reports on Form 10-Q. Therefore, these consolidated financial statements and footnotes do not include all disclosures required by GAAP for annual financial statements and should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2023. Financial results for an interim period are not necessarily indicative of the results for a full year. All intercompany transactions have been eliminated in consolidation. In the opinion of management, these statements reflect all adjustments (consisting only of normal, recurring adjustments) necessary for the fair presentation of our financial results for the interim periods presented.
New Accounting Pronouncements	New Accounting Pronouncements On November 27, 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures. This ASU provides additional guidance on reportable segment disclosures, including information on significant segment expenses and other items provided to the CODM by reportable segment and the title and position of the CODM. Additionally, annual segment disclosures currently reported under ASC 280 are now required for all interim periods. This standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. We believe this standard will expand our disclosures but will not impact our consolidated financial statements. We will adopt ASU 2023-07 retrospectively in the fourth quarter of 2024. On December 14, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740), Improvements to Income Tax Disclosures. This ASU expands the disclosures related to rate reconciliations by requiring entities to disclose items meeting a quantitative threshold and eight categories. The standard is effective for fiscal years beginning after December 15, 2024, with early adoption permitted. We believe this standard will expand our disclosures but will not impact our consolidated financial statements. We will adopt this standard prospectively in the fourth quarter of 2025.

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- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

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