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Other Assets, Net (Tables)
 12 Months Ended
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