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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