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Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Identifiable intangible assets consisted of the following at December 31:
(In millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
2019 |
Customer relationships |  | $ | 16,187 |  |  | $ | 2,145 |  |  | $ | 14,042 |
Acquired software and technology |  | 2,607 |  |  | 639 |  |  | 1,968 |
Trade names |  | 620 |  |  | 105 |  |  | 515 |
Capitalized software development costs |  | 942 |  |  | 332 |  |  | 610 |
Purchased software |  | 680 |  |  | 173 |  |  | 507 |
Total |  | $ | 21,036 |  |  | $ | 3,394 |  |  | $ | 17,642 |
(In millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
2018 |
Customer relationships |  | $ | 2,642 |  |  | $ | 1,294 |  |  | $ | 1,348 |
Acquired software and technology |  | 591 |  |  | 490 |  |  | 101 |
Trade names |  | 120 |  |  | 71 |  |  | 49 |
Capitalized software development costs |  | 810 |  |  | 314 |  |  | 496 |
Purchased software |  | 261 |  |  | 112 |  |  | 149 |
Total |  | $ | 4,424 |  |  | $ | 2,281 |  |  | $ | 2,143 |
Gross software development costs capitalized for new products and enhancements to existing products totaled $339 million, $193 million and $159 million in 2019, 2018 and 2017, respectively. Amortization expense associated with the above identifiable intangible assets was as follows for the years ended December 31:
(In millions) |  | 2019 |  | 2018 |  | 2017
Amortization expense |  | $ | 1,299 |  |  | $ | 347 |  |  | $ | 326 |
The Company estimates that annual amortization expense with respect to intangible assets recorded at December 31, 2019 will be as follows:
(In millions) |  |
Year ending December 31, |
2020 |  | $ | 2,490 |
2021 |  | 2,400 |
2022 |  | 2,168 |
2023 |  | 1,891 |
2024 |  | 1,572 |
Thereafter |  | 7,121 |
Total |  | $ | 17,642 |

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- Definition The entire disclosure for all or part of the information related to 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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