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Other Assets, Net (Details 2) (USD $) In Millions, unless otherwise specified |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Customer contracts and relationships | Dec. 31, 2012 Customer contracts and relationships | Dec. 31, 2013 Customer contracts and relationships Minimum | Dec. 31, 2013 Customer contracts and relationships Maximum | Dec. 31, 2013 Property tax abatement | Dec. 31, 2012 Property tax abatement | Dec. 31, 2013 Property tax abatement Minimum | Dec. 31, 2013 Property tax abatement Maximum | Dec. 31, 2013 Other agreements | Dec. 31, 2012 Other agreements | Dec. 31, 2013 Other agreements Minimum | Dec. 31, 2013 Other agreements Maximum | Dec. 31, 2013 Emission reduction credits | Dec. 31, 2012 Emission reduction credits
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Useful Lives |  |  |  |  | 1 year | 20 years |  |  | 7 years | 13 years |  |  | 25 years | 70 years |  |
Cost | $ 674 | $ 642 | $ 591 | $ 558 |  |  | $ 38 | $ 38 |  |  | $ 37 | $ 38 |  |  | $ 8 | $ 8
Accumulated amortization | (254) | (169) | (237) | (157) |  |  | (14) | (10) |  |  | (3) | (2) |  |  |  |
Net | 420 | 473 | 354 | 401 |  |  | 24 | 28 |  |  | 34 | 36 |  |  | 8 | 8
Estimated amortization expense related to finite-lived intangible assets for the next five years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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