Description of Business and Basis of Presentation Basis of Presentation Policy (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation, Policy [Policy Text Block]	Basis of Presentation General — The accompanying consolidated financial statements include the accounts of Swift Transportation Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in preparing the consolidated financial statements. When the Company does not have a controlling interest in an entity, but exerts significant influence over the entity, the Company applies the equity method of accounting.
Basis of Accounting, Policy [Policy Text Block]	In management's opinion, the accompanying financial statements were prepared in accordance with principles generally accepted in the United States and include all adjustments necessary for the fair presentation of the periods presented.

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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