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Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Land use rights [Member] | Dec. 31, 2011 Land use rights [Member] | Dec. 31, 2012 Water rights [Member] | Dec. 31, 2011 Water rights [Member] | Dec. 31, 2011 Trademark/Trade Name [Member] | Dec. 31, 2012 Trademark/Trade Name [Member] | Dec. 31, 2012 Other intangible assets | Dec. 31, 2011 Other intangible assets | Dec. 31, 2012 Project Development Rights [Member] | Dec. 31, 2011 Project Development Rights [Member] | Dec. 31, 2012 Sales Concessions [Member] | Dec. 31, 2011 Sales Concessions [Member] | Dec. 31, 2012 Contractuall Payment Rights [Member] | Dec. 31, 2011 Contractuall Payment Rights [Member] | Dec. 31, 2012 Management Rights [Member] | Dec. 31, 2011 Management Rights [Member] | Dec. 31, 2012 Emission allowances [Member] | Dec. 31, 2011 Emission allowances [Member] | Dec. 31, 2011 Electric security plan [Member] | Dec. 31, 2012 Electric security plan [Member] | Dec. 31, 2011 Contracts [Member] | Dec. 31, 2012 Contracts [Member] | Dec. 31, 2011 Customer relationships [Member] | Dec. 31, 2012 Customer relationships [Member] | Dec. 31, 2011 Other intangible assets [Member] | Dec. 31, 2012 Other intangible assets [Member] | Dec. 31, 2012 Renewable Energy Certificates [Member] | Dec. 31, 2011 DP&L [Member] | Dec. 31, 2011 DPL [Member] | Dec. 31, 2012 US Generation [Member] | Dec. 31, 2011 US Generation [Member] | Sep. 30, 2010 US Generation [Member] Deepwater [Member] | Dec. 31, 2012 US Utilities [Member] | Dec. 31, 2011 US Utilities [Member] | Dec. 31, 2012 Andes Generation [Member] | Dec. 31, 2011 Andes Generation [Member] | Dec. 31, 2012 MCAC Generation [Member] | Dec. 31, 2011 MCAC Generation [Member] | Dec. 31, 2012 EMEA Generation [Member] | Dec. 31, 2011 EMEA Generation [Member] | Dec. 31, 2012 Asia Generation [Member] | Dec. 31, 2011 Asia Generation [Member] | Sep. 30, 2011 Asia Generation [Member] Chigen [Member] | Dec. 31, 2012 Corporate Other And Other Eliminations [Member] | Dec. 31, 2011 Corporate Other And Other Eliminations [Member]
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 3,980 | $ 1,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 96 | $ 106 |  | $ 2,576 | $ 0 | $ 899 | $ 899 | $ 16 | $ 16 | $ 180 | $ 180 | $ 80 | $ 80 |  | $ 133 | $ 133
Accumulated impairment losses | (160) | (143) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21) | (21) |  | 0 | 0 | 0 | 0 | 0 | 0 | (122) | (122) | (17) | 0 |  | 0 | 0
Net balance | 3,820 | 1,271 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75 | 85 |  | 2,576 | 0 | 899 | 899 | 16 | 16 | 58 | 58 | 63 | 80 |  | 133 | 133
Impairment losses | 1,817 | 17 | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 18 | (1,817) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | (17) | 17 | 0 | 0
Goodwill acquired during the year | 0 | 2,576 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,440 | 2,600 | 0 | 0 |  | 0 | 2,576 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  | 0 | 0
Goodwill associated with the sale of a business | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |  | 0 |
Foreign currency translation and other | (4) | (10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) | (10) |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 0 |  | 0 | 0
Goodwill | 3,959 | 3,980 | 1,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87 | 96 |  | 2,576 | 2,576 | 899 | 899 | 16 | 16 | 180 | 180 | 68 | 80 |  | 133 | 133
Accumulated impairment losses | (1,960) | (160) | (143) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21) | (21) |  | (1,817) | 0 | 0 | 0 | 0 | 0 | (122) | (122) | 0 | (17) |  | 0 | 0
Net balance | 1,999 | 3,820 | 1,271 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66 | 75 |  | 759 | 2,576 | 899 | 899 | 16 | 16 | 58 | 58 | 68 | 63 |  | 133 | 133
Carrying Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  | 17 |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Balance | 624 | 645 |  |  |  |  |  |  |  |  |  | 102 | 109 | 194 | 199 | 72 | 69 | 40 | 39 | 4 | 14 | 87 | 87 | 44 | 44 | 66 | 66 | 18 | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization | 276 | 164 |  |  |  |  |  |  |  |  |  | (1) | (1) | (101) | (95) | (23) | (13) | (14) | (13) | 0 | 0 | (9) | (87) | (17) | (20) | (7) | (26) | (9) | (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Balance | 348 | 481 |  |  |  |  |  |  |  |  |  | 101 | 108 | 93 | 104 | 49 | 56 | 26 | 26 | 4 | 14 | 78 | 0 | 27 | 24 | 59 | 40 | 9 | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Amortization Expense 2013 | 32 |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 9 |  |  |  |  |  |  |  |  |  |  | 11 |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Amortization Expense 2014 | 25 |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 9 |  |  |  |  |  |  |  |  |  |  | 5 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Amortization Expense 2015 | 24 |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 9 |  |  |  |  |  |  |  |  |  |  | 4 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Amortization Expense 2016 | 17 |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 3 |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Amortization Expense 2017 | 16 |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 3 |  |  |  |  |  |  |  |  |  |  | 3 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 81 | 64 |  | 50 | 52 | 18 | 5 | 5 | 6 | 7 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87 |  | 28 |  | 32 |  | 4 |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AcquiredIndefiniteLivedIntangibleAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  | 13 |  | 5 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets Gross Excluding Goodwill | 705 | 709 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Balance | 429 | 545 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset amortization expense | $ 119 | $ 36 | $ 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Continuing Operations | 225.00% | 29.00% | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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