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Goodwill and Other Intangible Assets (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | $ 370 |  | $ 467 |
Accumulated Amortization | (153) |  | (222) |
Net Balance | 217 |  | 245 |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 80 |  | 79 |
Intangible Assets, Gross | 450 |  | 546 |
Intangible Assets, Net | 297 |  | 324 |
Land use rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 46 |  | 50 |
Water rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 20 |  | 18 |
Trademark/Trade name |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 5 |  | 6 |
Other |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 9 |  | 5 |
Project development rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 31 | [1] | 32 | [1]
Accumulated Amortization | (1) | [1] | (1) | [1]
Net Balance | 30 | [1] | 31 | [1]
Sales concessions |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 95 | [2] | 108 | [2]
Accumulated Amortization | (45) | [2] | (49) | [2]
Net Balance | 50 | [2] | 59 | [2]
Contractual payment rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 74 | [3] | 72 | [3]
Accumulated Amortization | (33) | [3] | (23) | [3]
Net Balance | 41 | [3] | 49 | [3]
Management rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 37 |  | 40 |
Accumulated Amortization | (13) |  | (14) |
Net Balance | 24 |  | 26 |
Emission allowances |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 4 |  | 5 |
Accumulated Amortization | 0 |  | 0 |
Net Balance | 4 |  | 5 |
Electric security plan |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 0 |  | 87 |
Accumulated Amortization | 0 |  | (87) |
Net Balance | 0 |  | 0 |
Contracts |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 46 |  | 44 |
Accumulated Amortization | (24) |  | (20) |
Net Balance | 22 |  | 24 |
Customer relationships & contracts |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 63 |  | 66 |
Accumulated Amortization | (34) |  | (26) |
Net Balance | 29 |  | 40 |
All other |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Balance | 20 | [4] | 13 | [4]
Accumulated Amortization | (3) | [4] | (2) | [4]
Net Balance | 17 | [4] | 11 | [4]
Poland wind projects | Discontinued Operations | Project development rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Net Balance | 70 |  |  |
Cameroon | Discontinued Operations | Contractual payment rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Net Balance | $ 32 |  | $ 34 |
[1] | Represent development rights, including but not limited to, land control, various permits and right to acquire equity interests in development projects resulting from asset acquisitions by our wind operations in the U.K. The balance excludes project development rights of $70 million relating to our Poland wind operations that were fully impaired in the third quarter of 2013 and subsequently sold in November 2013. See Note 23—Discontinued Operations and Held for Sale Businesses for further information.
[2] | Excludes net balance of sales concessions of $32 and $34 million as of December 31, 2013 and 2012, respectively, relating to our utility businesses in Cameroon that have been included in noncurrent assets of Discontinued Operations and Held for Sale Businesses. See Note 23—Discontinued Operations and Held for Sale Businesses for further information.
[3] | Represent legal rights to receive system reliability payments from the regulator.
[4] | Includes renewable energy certificates, land use rights and various other intangible assets none of which is individually significant.

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 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)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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