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Computer Software (Tables) | 12 Months Ended
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Dec. 31, 2017
Research and Development [Abstract] |
Computer Software | Intangible assets as of December 31, 2017 consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships and other | $ | 6,300 |  |  | $ | (2,442 | ) |  | $ | 3,858 |
Trademarks | 149 |  |  | (57 | ) |  | 92 |
| $ | 6,449 |  |  | $ | (2,499 | ) |  | $ | 3,950 |
Intangible assets as of December 31, 2016 consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships and other | $ | 6,367 |  |  | $ | (1,840 | ) |  | $ | 4,527 |
Trademarks | 180 |  |  | (43 | ) |  | 137 |
| $ | 6,547 |  |  | $ | (1,883 | ) |  | $ | 4,664 |
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 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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