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Computer Software | 12 Months Ended
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Dec. 31, 2017
Research and Development [Abstract] |
Computer Software | Computer Software Computer software as of December 31, 2017 and 2016 consists of the following (in millions):
| 2017 |  | 2016
Software from business acquisitions | $ | 1,130 |  |  | $ | 1,138 |
Capitalized software development costs | 1,422 |  |  | 1,066 |
Purchased software | 310 |  |  | 172 |
Computer software | 2,862 |  |  | 2,376 |
Accumulated amortization | (1,134 | ) |  | (768 | )
Computer software, net of accumulated amortization | $ | 1,728 |  |  | $ | 1,608 |
Amortization expense for computer software was $436 million, $396 million and $229 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 730 -URI http://asc.fasb.org/subtopic&trid=2197926 + Details
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