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Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation These statements have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission ("SEC") and, in accordance with those rules and regulations, do not include all information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). In the opinion of management, the condensed consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the results of operations, financial position and cash flows of Teradata Corporation ("Teradata" or the "Company") for the interim periods presented herein. The year-end 2020 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make use of estimates and assumptions that affect the reported amounts and disclosures. Actual results may vary from these estimates. These condensed consolidated interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in Teradata’s most recent Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the "2020 Annual Report"). The results of operations for any interim period are not necessarily indicative of the results of operations to be expected for the full year. Prior period amounts have been revised to conform to the current year presentation. At the beginning of the first quarter of 2021, the Company changed its historical presentation for certain components within its revenue and cost categories. To better reflect the strategy and shift in the business, the Company adopted and revised the presentation in the first quarter of 2021, including reclassifying managed services revenue of $25 million and costs of $20 million from Recurring to Consulting services and reclassifying third party revenue of $9 million and costs of $7 million from Recurring to Perpetual software licenses, hardware and other. This change in presentation does not affect the Company's total revenues, total costs of revenues or overall total gross profit (defined as total revenue less total cost of revenue).