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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets Intangible assets as of December 31, 2021, consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships | $ | 18,410 |  |  | $ | (7,141) |  |  | $ | 11,269 |
Trademarks and other | 509 |  |  | (239) |  |  | 270 |
Total Intangible assets, net | $ | 18,919 |  |  | $ | (7,380) |  |  | $ | 11,539 |
Intangible assets as of December 31, 2020, consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships | $ | 18,586 |  |  | $ | (5,024) |  |  | $ | 13,562 |
Trademarks and other | 555 |  |  | (189) |  |  | 366 |
Total Intangible assets, net | $ | 19,141 |  |  | $ | (5,213) |  |  | $ | 13,928 |
Amortization expense for intangible assets with finite lives was $2,383 million, $2,400 million and $1,444 million for the years ended December 31, 2021, 2020 and 2019, respectively. Estimated amortization of intangible assets for the next five years is as follows (in millions):
2022 | $ | 2,232 |
2023 | 2,042 |
2024 | 1,843 |
2025 | 1,675 |
2026 | 1,214 |

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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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