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Intangible Asset, Net | 12 Months Ended
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Dec. 31, 2024
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, 2024 |  | December 31, 2023
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships | 1 – 29 |  | $ | 2,767 |  |  | $ | (1,105) |  |  | $ | 1,662 |  |  | $ | 2,789 |  |  | $ | (932) |  |  | $ | 1,857 |
Other agreements | 15 – 70 |  | 28 |  |  | (13) |  |  | 15 |  |  | 30 |  |  | (12) |  |  | 18 |
Intangible assets (1) |  |  | $ | 2,795 |  |  | $ | (1,118) |  |  | $ | 1,677 |  |  | $ | 2,819 |  |  | $ | (944) |  |  | $ | 1,875 |
(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, 2024. 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, 2024, 2023 and 2022 was $266 million, $308 million and $254 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):
2025 | $ | 255 |
2026 | $ | 218 |
2027 | $ | 194 |
2028 | $ | 172 |
2029 | $ | 154 |

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