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Other Long-Term Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 |  |  |  |  |  | December 31, 2018 |  |  |  |
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships | 1 – 20 |  | $ | 1,134 |  |  | $ | (463) |  |  | $ | 671 |  |  | $ | 1,152 |  |  | $ | (413) |  |  | $ | 739 |
Property tax abatement | 7 – 13 |  | 23 |  |  | (18) |  |  | 5 |  |  | 23 |  |  | (16) |  |  | 7 |
Other agreements | 25 – 70 |  | 42 |  |  | (11) |  |  | 31 |  |  | 34 |  |  | (8) |  |  | 26 |
Intangible assets (1) |  |  | 1,199 |  |  | (492) |  |  | 707 |  |  | 1,209 |  |  | (437) |  |  | 772 |
Other |  |  | 152 |  |  | (1) |  |  | 151 |  |  | 144 |  |  | — |  |  | 144 |
Other long-term assets, net |  |  | $ | 1,351 |  |  | $ | (493) |  |  | $ | 858 |  |  | $ | 1,353 |  |  | $ | (437) |  |  | $ | 916 |
(1)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):
2020 | $ | 77 |
2021 | $ | 73 |
2022 | $ | 74 |
2023 | $ | 69 |
2024 | $ | 67 |

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