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Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Identifiable intangible assets consisted of the following:
(In millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
March 31, 2021 |  |
Customer relationships | $ | 15,256 |  |  | $ | 4,085 |  |  | $ | 11,171 |
Acquired software and technology | 2,617 |  |  | 953 |  |  | 1,664 |
Trade names | 629 |  |  | 189 |  |  | 440 |
Purchased software | 971 |  |  | 244 |  |  | 727 |
Capitalized software and other intangibles | 1,439 |  |  | 446 |  |  | 993 |
Total | $ | 20,912 |  |  | $ | 5,917 |  |  | $ | 14,995 |
(In millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
December 31, 2020 |  |
Customer relationships | $ | 15,271 |  |  | $ | 3,668 |  |  | $ | 11,603 |
Acquired software and technology | 2,562 |  |  | 879 |  |  | 1,683 |
Trade names | 618 |  |  | 172 |  |  | 446 |
Purchased software | 913 |  |  | 207 |  |  | 706 |
Capitalized software and other intangibles | 1,332 |  |  | 412 |  |  | 920 |
Total | $ | 20,696 |  |  | $ | 5,338 |  |  | $ | 15,358 |
Amortization expense associated with the above identifiable intangible assets was as follows:
|  | Three Months Ended March 31, |  |
(In millions) |  | 2021 |  | 2020 |  |  |  |
Amortization expense |  | $ | 642 |  |  | $ | 647 |  |  |  |  |
Amortization expense during the three months ended March 31, 2020 includes $10 million of accelerated amortization associated with the termination of certain vendor contracts (see Note 14).

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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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