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Acquired Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Gross Carrying Amount and Accumulated Amortization for Teradata's Acquired Intangible Assets | The gross carrying amount and accumulated amortization for the Company's acquired intangible assets were as follows:
|  |  | September 30, 2018 |  | December 31, 2017
In millions | Amortization Life (in Years) |  | Gross Carrying Amount |  | Accumulated Amortization and Currency Translation Adjustments |  | Gross Carrying Amount |  | Accumulated Amortization and Currency Translation Adjustments
Acquired intangible assets |  |  |  |  |  |  |  |  |
Intellectual property/developed technology | 3 to 5 |  | $ | 35 |  |  | $ | (18 | ) |  | $ | 43 |  |  | $ | (20 | )
Aggregate Amortization Expense for Acquired Intangible Assets | The aggregate amortization expense (actual and estimated) for acquired intangible assets is as follows:
|  | Three Months Ended September 30 |  | Nine Months Ended September 30,
In millions |  | 2018 |  | 2017 |  | 2018 |  | 2017
Amortization expense |  | $ | 1 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 6 |
|  | Actual |  | For the years ended (estimated)
In millions |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |
Amortization expense |  | $ | 8 |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 2 |  |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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