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Regulatory Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
integer
Dec. 31, 2011
Regulatory Assets [Line Items]    
Total Current Regulatory Assets $ 408 $ 391
Total Non Current Regulatory Assets 871 847
Total Regulatory Assets 1,279 1,238
Number of installments through which the Brazil tariff recoveries are made 24  
Regulatory Liabilities [Line Items]    
Total Current Regulatory Liabilities 388 733
Total Non Current Regulatory Liabilities 1,702 1,279
Total Regulatory Liabilities 2,090 2,012
Efficiency Program Costs [Member]
    
Regulatory Liabilities [Line Items]    
Total Current Regulatory Liabilities 32 29
Total Non Current Regulatory Liabilities 17 44
Brazil Tariff Recoveries Energy Purchases Liability [Member]
    
Regulatory Liabilities [Line Items]    
Total Current Regulatory Liabilities 171 305
Total Non Current Regulatory Liabilities 46 76
Brazil Tariff Recoveries Transmission Costs Regulatory Fees And Other Liability [Member]
    
Regulatory Liabilities [Line Items]    
Total Current Regulatory Liabilities 55 172
Total Non Current Regulatory Liabilities 42 64
AssetRetirementObligationCostsMember
    
Regulatory Liabilities [Line Items]    
Total Non Current Regulatory Liabilities 560 649
Brazil Special Obligations [Member]
    
Regulatory Liabilities [Line Items]    
Total Non Current Regulatory Liabilities 463 422
Other Regulatory Liabilities [Member]
    
Regulatory Liabilities [Line Items]    
Total Current Regulatory Liabilities 41 37
Total Non Current Regulatory Liabilities 129 24
Brazil Tariff Estimated Rate Change Liability [Member]
    
Regulatory Liabilities [Line Items]    
Total Current Regulatory Liabilities 89 190
Total Non Current Regulatory Liabilities 445 0
US Utilities [Member]
    
Regulatory Assets [Line Items]    
Total Regulatory Assets 737 692
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 700 679
Brazil Utilities [Member]
    
Regulatory Assets [Line Items]    
Total Regulatory Assets 427 438
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 1,390 1,333
Corporate Other And Other Eliminations [Member]
    
Regulatory Assets [Line Items]    
Total Regulatory Assets 115 108
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 0
Brazil Tariff Recoveries Energy Purchases Asset [Member]
    
Regulatory Assets [Line Items]    
Total Current Regulatory Assets 189 79
Total Non Current Regulatory Assets 97 84
Brazil Tariff Recoveries Transmission Costs Regulatory Fees And Other Asset [Member]
    
Regulatory Assets [Line Items]    
Total Current Regulatory Assets 78 185
Total Non Current Regulatory Assets 59 86
El Salvador Tariff Recoveries [Member]
    
Regulatory Assets [Line Items]    
Total Current Regulatory Assets 115 108
Pension Costs [Member]
    
Regulatory Assets [Line Items]    
Total Non Current Regulatory Assets 430 399
Income Taxes Recoverable From Customers [Member] [Member]
    
Regulatory Assets [Line Items]    
Total Non Current Regulatory Assets 81 76
Other Regulatory Assets [Member]
    
Regulatory Assets [Line Items]    
Total Current Regulatory Assets 26 19
Total Non Current Regulatory Assets 115 122
Other noncurrent regulatory assets that did not earn a rate of return 60 37
Other current regulatory assets that did not earn a rate of return 19 12
Deferred Midwest Independent Service Operator Costs [Member]
    
Regulatory Assets [Line Items]    
Total Non Current Regulatory Assets $ 89 $ 80