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Other Long-Term Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016
Intangible assets (1) | $ | 1,265 |  |  | $ | 603 |
Other | 60 |  |  | 48 |
| 1,325 |  |  | 651 |
Accumulated amortization | (421 | ) |  | (361 | )
| $ | 904 |  |  | $ | 290 |
(1) | We include rights-of-way, which are intangible assets, in our pipeline and related facilities amounts within property and equipment. See Note 5 for a discussion of property and equipment.
Components of intangible assets that have finite lives | Our intangible assets that have finite lives consisted of the following (in millions):
|  |  | December 31, 2017 |  | December 31, 2016
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships | 1 – 20 |  | $ | 1,188 |  |  | $ | (383 | ) |  | $ | 805 |  |  | $ | 529 |  |  | $ | (330 | ) |  | $ | 199 |
Property tax abatement | 7 – 13 |  | 38 |  |  | (30 | ) |  | 8 |  |  | 38 |  |  | (26 | ) |  | 12 |
Other agreements | 25 – 70 |  | 39 |  |  | (8 | ) |  | 31 |  |  | 36 |  |  | (5 | ) |  | 31 |
|  |  | $ | 1,265 |  |  | $ | (421 | ) |  | $ | 844 |  |  | $ | 603 |  |  | $ | (361 | ) |  | $ | 242 |
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):
2018 | $ | 63 |
2019 | $ | 68 |
2020 | $ | 74 |
2021 | $ | 75 |
2022 | $ | 76 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of noncurrent assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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