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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |
Schedule of Intangible Assets | Intangible assets as of December 31, 2017 consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships and other | $ | 6,220 |  |  | $ | (2,427 | ) |  | $ | 3,793 |
Trademarks | 149 |  |  | (57 | ) |  | 92 |
| $ | 6,369 |  |  | $ | (2,484 | ) |  | $ | 3,885 |
Intangible assets as of December 31, 2016 consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships and other | $ | 6,288 |  |  | $ | (1,835 | ) |  | $ | 4,453 |
Trademarks | 180 |  |  | (43 | ) |  | 137 |
| $ | 6,468 |  |  | $ | (1,878 | ) |  | $ | 4,590 |
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 |
Schedule of Estimated Amortization of Intangibles | Estimated amortization of intangibles, including the contract intangible in our Brazilian Venture, which is amortized as a reduction in revenue, for the next five years is as follows (in millions):
2018 | $ | 666 |
2019 | 655 |
2020 | 478 |
2021 | 447 |
2022 | 429 |

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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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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 + Details
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