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Other Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2014
Other Assets, Net |
Components of other assets, net of accumulated amortization |
|  | December 31, |
|  | 2014 |  | 2013 |
Intangible assets |  | $ | 676 |  | $ | 674 |
Debt issue costs |  | 92 |  | 70 |
Fair value of derivative instruments |  | 27 |  | 30 |
Other |  | 19 |  | 37 |
|  | 814 |  | 811 |
Accumulated amortization |  | (325 | ) | (271 | )
|  | $ | 489 |  | $ | 540 |
Components of intangible assets that have finite lives |
|  |  |  | December 31, 2014 |  | December 31, 2013 |
|  | Estimated Useful |  |  |  | Accumulated |  |  |  |  |  | Accumulated |  |  |
|  | Lives (Years) |  | Cost |  | Amortization |  | Net |  | Cost |  | Amortization |  | Net |
Customer contracts and relationships |  | 1 - 20 |  | $ | 593 |  | $ | (288 | ) | $ | 305 |  | $ | 591 |  | $ | (237 | ) | $ | 354 |
Property tax abatement |  | 7 - 13 |  | 38 |  | (18 | ) | 20 |  | 38 |  | (14 | ) | 24 |
Other agreements |  | 25 - 70 |  | 37 |  | (4 | ) | 33 |  | 37 |  | (3 | ) | 34 |
Emission reduction credits (1) |  | N/A |  | 8 |  | — |  | 8 |  | 8 |  | — |  | 8 |
|  |  |  | $ | 676 |  | $ | (310 | ) | $ | 366 |  | $ | 674 |  | $ | (254 | ) | $ | 420 |
| (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 |
2015 |  | $ | 52 |
2016 |  | $ | 44 |
2017 |  | $ | 41 |
2018 |  | $ | 36 |
2019 |  | $ | 33 |

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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=26713463&loc=d3e16323-109275 + Details
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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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: 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=26713463&loc=d3e16323-109275 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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