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Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Goodwill Roll Forward |  |  |
Goodwill | $ 1,486 | $ 1,493 |
Accumulated impairment losses | (215) | (194) |
Net balance | 1,271 | 1,299 |
Impairment losses | 17 | 21 | 122
Goodwill acquired during the year | 2,489 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | (10) | (7) |
Goodwill | 3,965 | 1,486 | 1,493
Accumulated impairment losses | (232) | (215) | (194)
Net balance | 3,733 | 1,271 | 1,299
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 667 | 538 |
Accumulated Amortization | 164 | 151 |
Net Balance | 503 | 387 |
Finite Lived Intangible Assets Future Amortization Expense Abstract |  |  |
Estimated Amortization Expense 2012 | 138 |  |
Estimated Amortization Expense 2013 | 32 |  |
Estimated Amortization Expense 2014 | 23 |  |
Estimated Amortization Expense 2015 | 22 |  |
Estimated Amortization Expense 2016 | 15 |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Gross Balance | 63 | 61 |
Intangible Assets Other Disclosures [Abstract] |  |  |
Gross Balance | 730 | 599 |
Net Balance | 566 | 448 |
Total intangible assets acquired | 172 | 227 |
Intangible asset amortization expense | 36 | 14 | 16
Project Development Rights [Member} |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount |  | 141 |
Contractual Payment Rights [Member] |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount |  | 65 |
Weighted Average Amortization Period |  | 10 |
Emission Allowances [Member] |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount |  | 14 |
Electric Security Plan [Member] |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount | 88 |  |
Weighted Average Amortization Period | 1 |  |
Customer Relationships [Member] |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount | 30 |  |
Weighted Average Amortization Period | 12 |  |
Customer Contracts [Member] |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount | 45 |  |
Weighted Average Amortization Period | 3 |  |
Other Intangible Assets [Member] |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amount | 4 |  |
Land Use Rights [Member] |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Gross Balance | 52 | 51 |
Acquired Indefinite Lived Intangible Assets [Line Items] |  |  |
Amount |  | 7 |
Emission Allowances [Member] |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Gross Balance | 4 | 8 |
Other Intangible Assets [Member] |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Gross Balance | 2 | 2 |
Trade Names [Member] |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Gross Balance | 5 | 0 |
Acquired Indefinite Lived Intangible Assets [Line Items] |  |  |
Amount | 5 |  |
Project Development Rights [Member} |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 102 | 117 |
Accumulated Amortization | 0 | 0 |
Net Balance | 102 | 117 |
Sales Concessions [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 156 | 162 |
Accumulated Amortization | (92) | (89) |
Net Balance | 64 | 73 |
Finite Lived Intangible Assets Future Amortization Expense Abstract |  |  |
Estimated Amortization Expense 2012 | 6 |  |
Estimated Amortization Expense 2013 | 6 |  |
Estimated Amortization Expense 2014 | 6 |  |
Estimated Amortization Expense 2015 | 6 |  |
Estimated Amortization Expense 2016 | 5 |  |
Contractual Payment Rights [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 69 | 65 |
Accumulated Amortization | (13) | (4) |
Net Balance | 56 | 61 |
Finite Lived Intangible Assets Future Amortization Expense Abstract |  |  |
Estimated Amortization Expense 2012 | 9 |  |
Estimated Amortization Expense 2013 | 9 |  |
Estimated Amortization Expense 2014 | 9 |  |
Estimated Amortization Expense 2015 | 9 |  |
Estimated Amortization Expense 2016 | 3 |  |
Land Use Rights [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 49 | 50 |
Accumulated Amortization | (4) | (2) |
Net Balance | 45 | 48 |
Management Rights [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 39 | 66 |
Accumulated Amortization | (13) | (30) |
Net Balance | 26 | 36 |
Emission Allowances [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 18 | 8 |
Accumulated Amortization | 0 | 0 |
Net Balance | 18 | 8 |
Electric Security Plan [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 88 | 0 |
Accumulated Amortization | (9) | 0 |
Net Balance | 79 | 0 |
Finite Lived Intangible Assets Future Amortization Expense Abstract |  |  |
Estimated Amortization Expense 2012 | 79 |  |
Estimated Amortization Expense 2013 | 0 |  |
Estimated Amortization Expense 2014 | 0 |  |
Estimated Amortization Expense 2015 | 0 |  |
Estimated Amortization Expense 2016 | 0 |  |
Customer Relationships [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 30 | 0 |
Accumulated Amortization | 0 | 0 |
Net Balance | 30 | 0 |
Finite Lived Intangible Assets Future Amortization Expense Abstract |  |  |
Estimated Amortization Expense 2012 | 35 |  |
Estimated Amortization Expense 2013 | 11 |  |
Estimated Amortization Expense 2014 | 4 |  |
Estimated Amortization Expense 2015 | 3 |  |
Estimated Amortization Expense 2016 | 3 |  |
Customer Contracts [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 45 | 0 |
Accumulated Amortization | (3) | 0 |
Net Balance | 42 | 0 |
Other Intangible Assets [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Balance | 71 | 70 |
Accumulated Amortization | (30) | (26) |
Net Balance | 41 | 44 |
Finite Lived Intangible Assets Future Amortization Expense Abstract |  |  |
Estimated Amortization Expense 2012 | 9 |  |
Estimated Amortization Expense 2013 | 6 |  |
Estimated Amortization Expense 2014 | 4 |  |
Estimated Amortization Expense 2015 | 4 |  |
Estimated Amortization Expense 2016 | 4 |  |
Deepwater Subsidiary [Member] |  |  |
Goodwill Roll Forward |  |  |
Impairment losses |  | 18 |
Carrying Amount |  | 18 |
Kilroot Subsidiary [Member] |  |  |
Goodwill Roll Forward |  |  |
Impairment losses |  |  | 118
Ukraine Subsidiaries [Member] |  |  |
Goodwill Roll Forward |  |  |
Impairment losses |  |  | 4
Chigen Affiliate [Member] |  |  |
Goodwill Roll Forward |  |  |
Impairment losses | 17 |  |
Carrying Amount | 17 |  |
Latin America Generation [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 926 | 926 |
Accumulated impairment losses | (24) | (24) |
Net balance | 902 | 902 |
Impairment losses | 0 | 0 |
Goodwill acquired during the year | 0 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | 0 | 0 |
Goodwill | 926 | 926 |
Accumulated impairment losses | (24) | (24) |
Net balance | 902 | 902 |
Latin America Utilities [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 140 | 140 |
Accumulated impairment losses | (7) | (7) |
Net balance | 133 | 133 |
Impairment losses | 0 | 0 |
Goodwill acquired during the year | 0 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | 0 | 0 |
Goodwill | 140 | 140 |
Accumulated impairment losses | (7) | (7) |
Net balance | 133 | 133 |
North America Generation [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 101 | 111 |
Accumulated impairment losses | (38) | (20) |
Net balance | 63 | 91 |
Impairment losses | 0 | (18) |
Goodwill acquired during the year | 0 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | (10) | (10) |
Goodwill | 91 | 101 |
Accumulated impairment losses | (38) | (38) |
Net balance | 53 | 63 |
North America Utilities [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 0 | 0 |
Accumulated impairment losses | 0 | 0 |
Net balance | 0 | 0 |
Impairment losses | 0 | 0 |
Goodwill acquired during the year | 2,489 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | 0 | 0 |
Goodwill | 2,489 | 0 |
Accumulated impairment losses | 0 | 0 |
Net balance | 2,489 | 0 |
Europe Generation [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 137 | 137 |
Accumulated impairment losses | (137) | (137) |
Net balance | 0 | 0 |
Impairment losses | 0 | 0 |
Goodwill acquired during the year | 0 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | 0 | 0 |
Goodwill | 137 | 137 |
Accumulated impairment losses | (137) | (137) |
Net balance | 0 | 0 |
Asia Generation [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 81 | 78 |
Accumulated impairment losses | 0 | 0 |
Net balance | 81 | 78 |
Impairment losses | (17) | 0 |
Goodwill acquired during the year | 0 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | 0 | 3 |
Goodwill | 81 | 81 |
Accumulated impairment losses | (17) | 0 |
Net balance | 64 | 81 |
Corporate Other And Other Eliminations [Member] |  |  |
Goodwill Roll Forward |  |  |
Goodwill | 101 | 101 |
Accumulated impairment losses | (9) | (6) |
Net balance | 92 | 95 |
Impairment losses | 0 | (3) |
Goodwill acquired during the year | 0 |  |
Goodwill associated with the sale of a business | 0 |  |
Foreign currency translation and other | 0 | 0 |
Goodwill | 101 | 101 |
Accumulated impairment losses | (9) | (9) |
Net balance | $ 92 | $ 92 |

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