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Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 04, 2013
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Assets $ 746 $ 637    
Total Non Current Regulatory Assets 918 872    
TOTAL REGULATORY ASSETS 1,664 1,509    
Total Current Regulatory Liabilities 465 605    
Total Non Current Regulatory Liabilities $ 1,286 $ 1,509    
Total period for adjustments to the Regulatory Asset Base (Up to) 4 years 4 years    
TOTAL REGULATORY LIABILITIES $ 1,751 $ 2,114 $ 269  
Period of annual tariff adjustment 12 months      
Total period to recover or refund costs for annual tariff adjustment 24 months      
Brazil Tariff Estimated Rate Change Liability        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Liabilities [1] $ 0 $ 76    
Total period to recover or refund costs for annual tariff adjustment   2 years    
Tariff adjustment, percentage amortized       67.55%
Tariff adjustment, percentage amortized in next tariff adjustment       32.45%
Efficiency Program Costs        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Liabilities [2] 12 $ 22    
Total Non Current Regulatory Liabilities [2] 5 11    
Brazil Regulatory Asset Base Adjustment        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Liabilities [3] 169 123    
Total Non Current Regulatory Liabilities [3] 86 61    
Brazil Tariff Recoveries Energy Purchases Liability        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Liabilities [4] 105 144    
Total Non Current Regulatory Liabilities [4] 30 128    
Brazil Tariff Recoveries Transmission Costs Regulatory Fees And Other Liability        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Liabilities [4] 120 174    
Total Non Current Regulatory Liabilities [4] 29 97    
Asset Retirement Obligation Costs        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Non Current Regulatory Liabilities [5] 759 727    
Brazil Special Obligations        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Non Current Regulatory Liabilities [6] 370 484    
Other Regulatory Liabilities        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Liabilities [7] 59 66    
Total Non Current Regulatory Liabilities [7] 7 1    
Brazil Tariff Recoveries Energy Purchases Asset        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Assets [4] 416 424    
Total Non Current Regulatory Assets [4] 147 266    
Brazil Tariff Recoveries Transmission Costs Regulatory Fees And Other Asset        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Assets [4] 264 63    
Total Non Current Regulatory Assets [4] 140 14    
El Salvador Tariff Recoveries        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Assets [8] 43 92    
Pension Costs        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Non Current Regulatory Assets [9],[10] 227 329    
Income Taxes Recoverable From Customers        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Non Current Regulatory Assets [9],[11] 36 74    
Deferred Midwest Independent Service Operator Costs        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Non Current Regulatory Assets [12] 129 111    
Other Regulatory Assets        
Schedule of Regulatory Assets and Liabilities [Line Items]        
Total Current Regulatory Assets [13] 23 58    
Total Non Current Regulatory Assets [13] 239 78    
Other current regulatory assets that did not earn a rate of return 8 22    
Other noncurrent regulatory assets that did not earn a rate of return $ 237 $ 73    
[1] (8)In July 2012, the Brazilian energy regulator (the "Regulator") approved the periodic review and reset of a component of Eletropaulo's regulated tariff, which determines the margin to be earned by Eletropaulo. The review and reset of this tariff component was retroactive to July 2011 and applied to customers' invoices from July 2012 to June 2015. From July 2011 through June 2012, Eletropaulo invoiced customers under the then-existing tariff rate, as required by the Regulator. As the new tariff rate was lower than the previous rate, Eletropaulo was required to reduce customer tariffs for the difference over the next year. Accordingly, from July 2011 through June 2012, Eletropaulo recognized a regulatory liability for the estimated future refunds, subsequently adjusted as of June 30, 2012 upon the finalization of the new tariff with the Regulator. The refund to customers was considered in the 2013 tariff adjustment, which contemplated an amortization of 67.55% from July 4, 2013. The remaining balance, representing 32.45%, was considered in the next annual tariff adjustment. There was no recorded current regulatory liability at Eletropaulo as of December 31, 2015.
[2] (9)Amounts received for costs expected to be incurred to improve the efficiency of our plants in Brazil as part of the IRT.
[3] (13) Represents adjustments to the RAB resulting from an administrative ruling in December 2013 compelling Eletropaulo to refund customers beginning July 2014.
[4] (1)Recoverable or refundable per Brazilian National Electric Energy Agency ("ANEEL") regulations through the Annual Tariff Adjustment ("IRT"). These costs are generally non-controllable and primarily consist of purchased electricity, energy transmission, and sector costs that are considered volatile. The costs are passed through for a period of 12 months as part of the IRT. Any remaining balance is considered in the subsequent IRT, which results in a total of 24 months to recover or refund the costs. Favorable spot market sales are also subject to customer refunds through the IRT over the course of these time periods.
[5] (11)Obligations for removal costs which do not have an associated legal retirement obligation as defined by the accounting standards on asset retirement obligations.
[6] (12)Obligations established by ANEEL in Brazil associated with electric utility concessions and represent amounts received from customers or donations not subject to return. These donations are allocated to support energy network expansion and to improve utility operations to meet customers' needs. The term of the obligation is established by ANEEL. Settlement shall occur when the concession ends.
[7] (10)Other current and noncurrent regulatory liabilities primarily consist of liabilities owed to electricity generators due to variance in energy prices during rationing periods ("Free Energy"). Our Brazilian subsidiaries are authorized to refund this cost associated with monthly energy price variances between the wholesale energy market prices owed to the power generation plants producing Free Energy and the capped price reimbursed by the local distribution companies which are passed through to the final customers through energy tariffs. The balance excludes asset retirement obligations that were reclassified out of Other.
[8] (2)Deferred fuel costs incurred by our El Salvador subsidiaries associated with purchase of energy from the El Salvador spot market and power generation plants. In El Salvador, the deferred fuel adjustment represents the variance between the actual fuel costs and the fuel costs recovered in the tariffs. The variance is recovered quarterly in the tariff reset period.
[9] (4)Past expenditures on which the Company does not earn a rate of return.
[10] (5)The regulatory accounting standards allow the defined pension and postretirement benefit obligation to be recorded as a regulatory asset equal to the previously unrecognized actuarial gains and losses and prior service costs that are expected to be recovered through future rates. Pension expense is recognized based on the plan's actuarially determined pension liability. Recovery of costs is probable, but not yet determined. Pension contributions made by our Brazilian subsidiaries are not included in regulatory assets as those contributions are not covered by the established tariff in Brazil.
[11] (6)Probable recovery through future rates, based upon established regulatory practices, which permit the recovery of current taxes. This amount is expected to be recovered, without interest, over the period as book-tax temporary differences reverse and become current taxes.
[12] (7)Transmission service costs and other administrative costs from IPL's participation in the Midwest ISO market, which are recoverable but do not earn a rate of return. Recovery of costs is probable, but the timing is not yet determined.
[13] (3)Includes assets with and without a rate of return. Other current regulatory assets that did not earn a rate of return were $8 million and $22 million, as of December 31, 2015 and 2014, respectively. Other noncurrent regulatory assets that did not earn a rate of return were $237 million and $73 million, as of December 31, 2015 and 2014, respectively. Other current and noncurrent regulatory assets primarily consist of:▪Unamortized losses on long-term debt reacquired or redeemed in prior periods at IPL and DPL, which are amortized over the lives of the original issues in accordance with the Federal Energy Regulatory Commission ("FERC") and PUCO rules.▪Unamortized carrying charges and certain other costs related to Petersburg unit 4 at IPL.▪Deferred storm costs incurred primarily in 2008 to repair storm damage at DPL; recovery was approved via order from the PUCO on December 17, 2014 and began January 2015.▪Additional Regulatory Asset Base ("RAB") from a favorable decision on tariff reset (administrative appeal) at Eletropaulo.