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Intangible Asset, Net | 12 Months Ended
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Dec. 31, 2021
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, 2021 |  | December 31, 2020
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships (1) | 3 – 31 |  | $ | 2,445 |  |  | $ | (510) |  |  | $ | 1,935 |  |  | $ | 1,291 |  |  | $ | (519) |  |  | $ | 772 |
Other agreements | 1 – 70 |  | 36 |  |  | (11) |  |  | 25 |  |  | 63 |  |  | (30) |  |  | 33 |
Intangible assets (2) |  |  | $ | 2,481 |  |  | $ | (521) |  |  | $ | 1,960 |  |  | $ | 1,354 |  |  | $ | (549) |  |  | $ | 805 |
(1)The increase in intangible assets related to Customer contracts and relationships in 2021 is associated with the assets acquired in the formation of the Permian JV. 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. 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, 2021. Amortization expense for finite-lived intangible assets for the years ended December 31, 2021, 2020 and 2019 was $122 million, $90 million and $76 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):
2022 | $ | 240 |
2023 | $ | 232 |
2024 | $ | 220 |
2025 | $ | 207 |
2026 | $ | 187 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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