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Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets Intangible assets as of December 31, 2023, consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships | $ | 6,326 |  |  | $ | (4,583) |  |  | $ | 1,743 |
Trademarks and other | 142 |  |  | (62) |  |  | 80 |
Total Intangible assets, net | $ | 6,468 |  |  | $ | (4,645) |  |  | $ | 1,823 |
Intangible assets as of December 31, 2022, consist of the following (in millions):
| Cost |  | Accumulated Amortization |  | Net
Customer relationships | $ | 6,281 |  |  | $ | (3,953) |  |  | $ | 2,328 |
Trademarks and other | 193 |  |  | (53) |  |  | 140 |
Total Intangible assets, net | $ | 6,474 |  |  | $ | (4,006) |  |  | $ | 2,468 |
Amortization expense for intangible assets with finite lives was $467 million, $486 million and $484 million for the years ended December 31, 2023, 2022 and 2021, respectively. Estimated amortization of intangible assets for the next five years is as follows (in millions):
2024 | $ | 634 |
2025 | 560 |
2026 | 192 |
2027 | 161 |
2028 | 143 |

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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/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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