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Property Plant and Equipment (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 MW | Dec. 31, 2011 | Dec. 31, 2010
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | $ 31,837,000,000 | $ 31,068,000,000 |
Accumulated depreciation | (9,723,000,000) | (8,944,000,000) |
Net electric generation and distribution assets and other | 22,114,000,000 | 22,124,000,000 |
Net electric generation, distribution assets and other related to discontinued operations | 0 | 1,200,000,000 |
Interest Costs Incurred Capitalized [Abstract] |  |  |
Depreciation expense (including amortization of assets recorded under capital leases) | 1,251,000,000 | 1,154,000,000 | 1,010,000,000
Amortization of internal use software | 48,000,000 | 46,000,000 | 50,000,000
Interest capitalized during development and contstruction | 111,000,000 | 176,000,000 | 188,000,000
Other PP&E Disclosures |  |  |
Property, plant and equipment (net of accumulated depreciation) mortgaged, pledged or subject to liens | 16,000,000,000 | 15,200,000,000 |
Unamortized software costs included in net electric generation and distribution assets and other | 153,000,000 | 156,000,000 |
Depreciation expense (including amortization of assets recorded under capital leases) | 1,251,000,000 | 1,154,000,000 | 1,010,000,000
Capitalized Computer Software Amortization | 48,000,000 | 46,000,000 | 50,000,000
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Balance at January 1 | 117,000,000 | 88,000,000 |
Additional liabilities incurred | 3,000,000 | 1,000,000 |
Assumed in business combination | 0 | 24,000,000 |
Liabilities settled | (3,000,000) | 0 |
Accretion expense | 7,000,000 | 6,000,000 |
Change in estimated cash flows | 3,000,000 | (1,000,000) |
Translation adjustments | 1,000,000 | (1,000,000) |
Balance at December 31 | 128,000,000 | 117,000,000 | 88,000,000
Fair Value Of Restricted Assets For Settling ARO's |  | 1,000,000 |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Generation Capacity (MW) | 2,465 |  |
Beckjord Unit 6 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 50.00% |  |
Generation Capacity (MW) | 207 |  |
Gross Plant In Service | 0 |  |
Accumulated Depreciation | 0 |  |
Construction Work in Process | 0 |  |
Conesville Unit 4 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 17.00% |  |
Generation Capacity (MW) | 129 |  |
Gross Plant In Service | 41,000,000 |  |
Accumulated Depreciation | 3,000,000 |  |
Construction Work in Process | 11,000,000 |  |
East Bend Station [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 31.00% |  |
Generation Capacity (MW) | 186 |  |
Gross Plant In Service | 8,000,000 |  |
Accumulated Depreciation | 2,000,000 |  |
Construction Work in Process | 3,000,000 |  |
Killen Station [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 67.00% |  |
Generation Capacity (MW) | 402 |  |
Gross Plant In Service | 299,000,000 |  |
Accumulated Depreciation | 0 |  |
Construction Work in Process | 5,000,000 |  |
Miami Fort Units 7 And 8 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 36.00% |  |
Generation Capacity (MW) | 368 |  |
Gross Plant In Service | 213,000,000 |  |
Accumulated Depreciation | 7,000,000 |  |
Construction Work in Process | 3,000,000 |  |
Stuart Station [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 35.00% |  |
Generation Capacity (MW) | 808 |  |
Gross Plant In Service | 200,000,000 |  |
Accumulated Depreciation | 6,000,000 |  |
Construction Work in Process | 12,000,000 |  |
Zimmer Station [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Ownership | 28.00% |  |
Generation Capacity (MW) | 365 |  |
Gross Plant In Service | 169,000,000 |  |
Accumulated Depreciation | 12,000,000 |  |
Construction Work in Process | 2,000,000 |  |
Transmission |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Gross Plant In Service | 39,000,000 |  |
Accumulated Depreciation | 3,000,000 |  |
Construction Work in Process | 0 |  |
Total Jointly Owned Plant [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Gross Plant In Service | 969,000,000 |  |
Accumulated Depreciation | 33,000,000 |  |
Construction Work in Process | 36,000,000 |  |
Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | 14,650,000,000 | 14,398,000,000 |
Accumulated depreciation | (5,221,000,000) | (5,029,000,000) |
Net electric generation and distribution assets and other | 9,429,000,000 | 9,369,000,000 |
Non Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | 17,187,000,000 | 16,670,000,000 |
Accumulated depreciation | (4,502,000,000) | (3,915,000,000) |
Net electric generation and distribution assets and other | 12,685,000,000 | 12,755,000,000 |
Electric generation and distribution facilities |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | 27,586,000,000 | 26,821,000,000 |
Electric generation and distribution facilities | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 5 years |  |
Electric generation and distribution facilities | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 68 years |  |
Other buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | 2,840,000,000 | 2,924,000,000 |
Other buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 3 years |  |
Other buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 50 years |  |
Furniture Fixtures And Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | 472,000,000 | 476,000,000 |
Furniture Fixtures And Equipment [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 3 years |  |
Furniture Fixtures And Equipment [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 31 years |  |
Other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other | $ 939,000,000 | $ 847,000,000 |
Other | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 1 year |  |
Other | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant And Equipment Useful Life | 46 years |  |

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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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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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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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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