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Other Long-Term Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2016
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,
| 2016 |  | 2015
Intangible assets (1) | $ | 603 |  |  | $ | 610 |
Fair value of derivative instruments | 1 |  |  | 9 |
Other | 47 |  |  | 94 |
| 651 |  |  | 713 |
Accumulated amortization | (361 | ) |  | (327 | )
| $ | 290 |  |  | $ | 386 |
(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 | Intangible assets that have finite lives are tested for impairment when events or circumstances indicate that the carrying value may not be recoverable. Our intangible assets that have finite lives consisted of the following (in millions):
|  |  | December 31, 2016 |  | December 31, 2015
| Estimated Useful Lives (Years) |  | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Customer contracts and relationships | 1 – 20 |  | $ | 529 |  |  | $ | (330 | ) |  | $ | 199 |  |  | $ | 537 |  |  | $ | (301 | ) |  | $ | 236 |
Property tax abatement | 7 – 13 |  | 38 |  |  | (26 | ) |  | 12 |  |  | 38 |  |  | (22 | ) |  | 16 |
Other agreements | 25 – 70 |  | 29 |  |  | (5 | ) |  | 24 |  |  | 28 |  |  | (4 | ) |  | 24 |
Emission reduction credits (1) | N/A |  | 7 |  |  | — |  |  | 7 |  |  | 7 |  |  | — |  |  | 7 |
|  |  | $ | 603 |  |  | $ | (361 | ) |  | $ | 242 |  |  | $ | 610 |  |  | $ | (327 | ) |  | $ | 283 |
(1) | Emission reduction credits, once surrendered in exchange for environmental permits, are finite-lived.
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):
2017 | $ | 42 |
2018 | $ | 37 |
2019 | $ | 34 |
2020 | $ | 32 |
2021 | $ | 30 |

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