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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets Intangible assets as of December 31, 2020, consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships and other | $ | 18,586 |  |  | $ | (5,024) |  |  | $ | 13,562 |
Finite-lived trademarks | 511 |  |  | (189) |  |  | 322 |
Indefinite-lived trademarks | 44 |  |  | — |  |  | 44 |
Total Intangible assets, net | $ | 19,141 |  |  | $ | (5,213) |  |  | $ | 13,928 |
Intangible assets as of December 31, 2019, consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships and other | $ | 18,018 |  |  | $ | (2,681) |  |  | $ | 15,337 |
Finite-lived trademarks | 503 |  |  | (85) |  |  | 418 |
Indefinite-lived trademarks | 43 |  |  | — |  |  | 43 |
Total Intangible assets, net | $ | 18,564 |  |  | $ | (2,766) |  |  | $ | 15,798 |
Amortization expense for intangible assets with finite lives, including the contract intangible in our Brazilian Venture, which was amortized as a reduction of revenue until impaired during the third quarter of 2018 (see Note 19), was $2,400 million, $1,444 million and $659 million for the years ended December 31, 2020, 2019 and 2018, respectively. Estimated amortization of intangible assets for the next five years is as follows (in millions):
2021 | $ | 2,378 |
2022 | 2,226 |
2023 | 2,035 |
2024 | 1,836 |
2025 | 1,667 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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