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Intangible Asset, Net | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Asset, Net | Intangible Assets, Net Intangible assets, net of accumulated amortization, consisted of the following (in millions):
|  |  | December 31, 2023 |  | December 31, 2022
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships | 1 – 29 |  | $ | 2,789 |  |  | $ | (932) |  |  | $ | 1,857 |  |  | $ | 2,817 |  |  | $ | (695) |  |  | $ | 2,122 |
Other agreements | 15 – 70 |  | 30 |  |  | (12) |  |  | 18 |  |  | 35 |  |  | (12) |  |  | 23 |
Intangible assets (1) |  |  | $ | 2,819 |  |  | $ | (944) |  |  | $ | 1,875 |  |  | $ | 2,852 |  |  | $ | (707) |  |  | $ | 2,145 |
(1)We include rights-of-way, which are intangible assets, within property and equipment. See Note 6 for a discussion of property and equipment. Intangible assets that have finite lives are tested for impairment when events or circumstances indicate that the carrying value may not be recoverable. We did not recognize any impairments of finite-lived intangible assets during the three years ended December 31, 2023. The majority of our finite-lived intangible assets are amortized under the declining balance method. Amortization expense for finite-lived intangible assets for the years ended December 31, 2023, 2022 and 2021 was $308 million, $254 million and $122 million, respectively. We estimate that our amortization expense related to finite-lived intangible assets for the next five years will be as follows (in millions):
2024 | $ | 272 |
2025 | $ | 249 |
2026 | $ | 210 |
2027 | $ | 187 |
2028 | $ | 165 |

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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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