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Computer Software (Tables) | 12 Months Ended
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Dec. 31, 2016
Research and Development [Abstract] |
Computer Software | Intangible assets as of December 31, 2016 consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships | $ | 6,367 |  |  | $ | (1,840 | ) |  | $ | 4,527 |
Trademarks | 180 |  |  | (43 | ) |  | 137 |
| $ | 6,547 |  |  | $ | (1,883 | ) |  | $ | 4,664 |
Intangible assets as of December 31, 2015 consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships | $ | 6,782 |  |  | $ | (1,782 | ) |  | $ | 5,000 |
Trademarks | 181 |  |  | (22 | ) |  | 159 |
| $ | 6,963 |  |  | $ | (1,804 | ) |  | $ | 5,159 |
Computer software as of December 31, 2016 and 2015 consists of the following (in millions):
| 2016 |  | 2015
Software from business acquisitions | $ | 1,138 |  |  | $ | 1,189 |
Capitalized software development costs | 1,066 |  |  | 985 |
Purchased software | 172 |  |  | 126 |
Computer software | 2,376 |  |  | 2,300 |
Accumulated amortization | (768 | ) |  | (716 | )
Computer software, net of accumulated amortization | $ | 1,608 |  |  | $ | 1,584 |

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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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