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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets Customer relationships and other intangible assets are obtained as part of acquired businesses and are amortized over their estimated useful lives, generally five to 10 years, using accelerated methods. Trademarks determined to have indefinite lives are not amortized. Certain other trademarks are amortized over periods ranging up to 15 years. As of December 31, 2017 and 2016, trademarks carried at $48 million and $80 million, respectively, were classified as indefinite-lived. 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 |
Amortization expense for intangible assets with finite lives, including the contract intangible in our Brazilian Venture, which is amortized as a reduction of revenue, was $679 million, $523 million and $246 million for the years ended December 31, 2017, 2016 and 2015, respectively. 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 | $ | 678 |
2019 | 667 |
2020 | 489 |
2021 | 457 |
2022 | 439 |

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- References No definition available. + Details
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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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