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Property Plant and Equipment (Details) | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2011 USD ($) | Dec. 31, 2011 EUR (€) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2011 Beckjord Unit 6 [Member] USD ($) | Dec. 31, 2011 Conesville Unit 4 [Member] USD ($) | Dec. 31, 2011 East Bend Station [Member] USD ($) | Dec. 31, 2011 Killen Station [Member] USD ($) | Dec. 31, 2011 Miami Fort Units 7 And 8 [Member] USD ($) | Dec. 31, 2011 Stuart Station [Member] USD ($) | Dec. 31, 2011 Zimmer Station [Member] USD ($) | Dec. 31, 2011 Transmission [Member] USD ($) | Dec. 31, 2011 Total Jointly Owned Plant [Member] USD ($) | Dec. 31, 2011 Regulated [Member] USD ($) | Dec. 31, 2010 Regulated [Member] USD ($) | Dec. 31, 2011 Non Regulated [Member] USD ($) | Dec. 31, 2010 Non Regulated [Member] USD ($) | Dec. 31, 2011 Electric generation and distribution facilities USD ($) years | Dec. 31, 2010 Electric generation and distribution facilities USD ($) | Dec. 31, 2011 Other buildings USD ($) years | Dec. 31, 2010 Other buildings USD ($) | Dec. 31, 2011 Furniture, fixtures and equipment USD ($) years | Dec. 31, 2010 Furniture, fixtures and equipment USD ($) | Dec. 31, 2011 Other USD ($) years | Dec. 31, 2010 Other USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution assets and other | $ 31,948,000,000 |  | $ 26,514,000,000 |  |  |  |  |  |  |  |  |  |  | $ 14,468,000,000 | $ 12,006,000,000 | $ 17,480,000,000 | $ 14,508,000,000 | $ 27,627,000,000 | $ 23,133,000,000 | $ 2,927,000,000 | $ 2,085,000,000 | $ 481,000,000 | $ 484,000,000 | $ 913,000,000 | $ 812,000,000
Accumulated depreciation | (9,145,000,000) |  | (8,643,000,000) |  |  |  |  |  |  |  |  |  |  | (5,029,000,000) | (4,961,000,000) | (4,116,000,000) | (3,682,000,000) |  |  |  |  |  |  |  |
Net electric generation and distribution assets and other | 22,803,000,000 |  | 17,871,000,000 |  |  |  |  |  |  |  |  |  |  | 9,439,000,000 | 7,045,000,000 | 13,364,000,000 | 10,826,000,000 |  |  |  |  |  |  |  |
Estimated Useful Life Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 3 |  | 3 |  | 1 |
Estimated Useful Life Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69 |  | 50 |  | 31 |  | 46 |
Net electric generation, distribution assets and other related to discontinued operations | 622,000,000 |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Costs Incurred, Capitalized [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest capitalized during development and construction | 176,000,000 |  | 188,000,000 | 183,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other PP&E Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction Of Property Plant And Equipment From Recovery Of Liquidated Damages | 178,000,000 | 137,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment (net of accumulated depreciation) mortgaged, pledged or subject to liens | 13,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation | 1,200,000,000 |  | 1,100,000,000 | 891,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized software costs included in net electric generation and distribution assets and other | 157,000,000 |  | 164,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software amortization expense | 46,000,000 |  | 50,000,000 | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation Roll Forward Analysis Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at January 1 | 88,000,000 |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional liabilities incurred | 1,000,000 |  | 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed in business combination | 24,000,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion expense | 6,000,000 |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in estimated cash flows | (1,000,000) |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Translation adjustments | (1,000,000) |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31 | 117,000,000 |  | 88,000,000 | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Of Restricted Assets For Settling ARO's | 1,000,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership |  |  |  |  | 50.00% | 17.00% | 31.00% | 67.00% | 36.00% | 35.00% | 28.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production Capacity (MW) |  |  |  |  | 210 | 129 | 186 | 402 | 368 | 820 | 365 |  | 2,480 |  |  |  |  |  |  |  |  |  |  |  |
Gross Plant In Service |  |  |  |  | 0 | 0 | 0 | 331,000,000 | 239,000,000 | 181,000,000 | 161,000,000 | 34,000,000 | 946,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Depreciation |  |  |  |  | 0 | 0 | 0 | 0 | 1,000,000 | 1,000,000 | 2,000,000 | 0 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Construction Work in Process |  |  |  |  | $ 0 | $ 2,000,000 | $ 2,000,000 | $ 4,000,000 | $ 2,000,000 | $ 14,000,000 | $ 24,000,000 | $ 0 | $ 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -Subparagraph c(4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS86 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Total interest costs incurred during the period that are capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Period Type: | duration

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- Definition This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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Balance Type: | debit
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- Definition The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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Period Type: | duration

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- Definition The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration