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Acquired Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Acquired Intangible Assets | Acquired Intangible Assets Acquired intangible assets were specifically identified when acquired and are deemed to have finite lives. 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 | )
The gross carrying amount of acquired intangibles was reduced by certain intangible assets previously acquired that became fully amortized and were removed from the balance sheet. 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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- References No definition available. + Details
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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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