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Other Long-Term Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Assets [Abstract] |
Components of other long-term assets, net of accumulated amortization | Other long-term assets, net of accumulated amortization, consisted of the following (in millions):
|  |  | December 31, 2020 |  | December 31, 2019
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships (1) | 3 – 29 |  | $ | 1,291 |  |  | $ | (519) |  |  | $ | 772 |  |  | $ | 1,134 |  |  | $ | (463) |  |  | $ | 671 |
Property tax abatement | 13 |  | 23 |  |  | (20) |  |  | 3 |  |  | 23 |  |  | (18) |  |  | 5 |
Other agreements | 1 – 70 |  | 40 |  |  | (10) |  |  | 30 |  |  | 42 |  |  | (11) |  |  | 31 |
Intangible assets (2) |  |  | 1,354 |  |  | (549) |  |  | 805 |  |  | 1,199 |  |  | (492) |  |  | 707 |
Other |  |  | 165 |  |  | (3) |  |  | 162 |  |  | 152 |  |  | (1) |  |  | 151 |
Other long-term assets, net |  |  | $ | 1,519 |  |  | $ | (552) |  |  | $ | 967 |  |  | $ | 1,351 |  |  | $ | (493) |  |  | $ | 858 |
(1)Amounts for the year ended December 31, 2020 include intangible assets associated with the acquisition of FM Gathering. See Note 7 for additional information. (2)We include rights-of-way, which are intangible assets, in our pipeline and related facilities amounts within property and equipment. See Note 6 for a discussion of property and equipment.
Estimated amortization expense related to finite-lived intangible assets for the next five years | We estimate that our amortization expense related to finite-lived intangible assets for the next five years will be as follows (in millions):
2021 | $ | 87 |
2022 | $ | 86 |
2023 | $ | 82 |
2024 | $ | 80 |
2025 | $ | 77 |

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