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Equity (Transactions with Noncontrolling Interests) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 28, 2017
Feb. 18, 2016
Nov. 18, 2015
Feb. 11, 2015
Dec. 31, 2015
Nov. 30, 2015
Feb. 28, 2015
Dec. 31, 2014
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 17, 2017
Apr. 01, 2015
Jun. 25, 2014
Noncontrolling Interest [Line Items]                                  
Gain (Loss) on Disposition of Business                       $ (52,000,000) $ 29,000,000 $ 29,000,000      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                       6.70%          
Stockholders' Equity Attributable to Parent                       $ 2,465,000,000 2,794,000,000        
Additional Paid in Capital                       8,501,000,000 8,592,000,000        
Accumulated Other Comprehensive Income (Loss), Net of Tax         $ (3,883,000,000)         $ (3,883,000,000)   (1,876,000,000) $ (2,756,000,000) (3,883,000,000)      
Alto Maipo [Member]                                  
Noncontrolling Interest [Line Items]                                  
Gain (Loss) on Disposition of Business                       $ 0          
Business Acquisition, Percentage of Voting Interests Acquired                       40.00%          
Noncontrolling Interest, Ownership Percentage by Parent                       62.00%          
Stockholders' Equity Attributable to Parent                       $ 196,000,000          
Additional Paid in Capital                       229,000,000          
Accumulated Other Comprehensive Income (Loss), Net of Tax                       $ (33,000,000)          
Masinloc Subsidiary [Member]                                  
Noncontrolling Interest [Line Items]                                  
Divestiture of Businesses, Portion Contingent Upon Achievement of Certain Restructuring Efficiencies                                 $ 23,000,000
Disposal Group Not Discontinued Operation Ownership Interest Sold                       100.00%     51.00%   45.00%
Dominican Republic                                  
Noncontrolling Interest [Line Items]                                  
Gain (Loss) on Disposition of Business                       $ 0   0      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                       5.00% 10.00%        
Proceeds from divestiture of business $ 60,000,000                                
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price         $ 18,000,000                        
Gain on Disposition of Stock in Subsidiary, Recorded to APIC                   $ 7,000,000   $ 25,000,000          
Cachagua [Member]                                  
Noncontrolling Interest [Line Items]                                  
Noncontrolling Interest, Ownership Percentage by Parent     99.90%                            
Gener Subsidiary [Member]                                  
Noncontrolling Interest [Line Items]                                  
Gain on Disposition of Stock in Subsidiary, Recorded to APIC     $ 24,000,000                            
Sale of Stock, Consideration Received Per Transaction     $ 145,000,000                            
Sale of Stock, Percentage of Ownership before Transaction     70.70%                            
Sale of Stock, Percentage of Ownership after Transaction     66.70%                            
IPP4 [Member]                                  
Noncontrolling Interest [Line Items]                                  
Noncontrolling Interest, Ownership Percentage by Parent                         36.00%        
AES US Investment, Inc.                                  
Noncontrolling Interest [Line Items]                                  
Investment In Affiliate Ownership Percentage Sold       15.00%                          
Sale of Stock, Consideration Received Per Transaction       $ 247,000,000                          
IPALCO Enterprises, Inc. [Member]                                  
Noncontrolling Interest [Line Items]                                  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                               24.90%  
sales agreement, Buyer option to purchase ownership interest, exercised                               $ 214,000,000  
Gener Subsidiary [Member]                                  
Noncontrolling Interest [Line Items]                                  
Gain (Loss) on Disposition of Business           $ 0                      
Disposal Group Not Discontinued Operation Ownership Interest Sold     4.00%                            
Jordan [Member]                                  
Noncontrolling Interest [Line Items]                                  
Disposal Group, Including Discontinued Operation, Consideration   $ 21,000,000                              
Gain (Loss) on Disposition of Business   $ 4,000,000                              
Disposal Group Not Discontinued Operation Ownership Interest Sold   40.00%                              
Acquire additional shares through 2016                                  
Noncontrolling Interest [Line Items]                                  
Investment Options, acquisition percentage             17.65%                    
Acquire additional shares through December 31, 2017 [Member] | Dominican Republic                                  
Noncontrolling Interest [Line Items]                                  
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price               $ 125,000,000                  
Additional Paid-in Capital [Member]                                  
Noncontrolling Interest [Line Items]                                  
Sale of subsidiary shares to noncontrolling interests                       13,000,000 $ 84,000,000 323,000,000      
Additional Paid-in Capital [Member] | AES Brasiliana [Domain]                                  
Noncontrolling Interest [Line Items]                                  
Other Restructuring Costs                         27,000,000        
Additional Paid-in Capital [Member] | IPALCO Enterprises, Inc. [Member]                                  
Noncontrolling Interest [Line Items]                                  
Business Combination, Separately Recognized Transactions, Additional Disclosures, Issuance Costs Not Expensed                     $ 84,000,000            
Retained Earnings (Accumulated Deficit)                                  
Noncontrolling Interest [Line Items]                                  
Sale of subsidiary shares to noncontrolling interests                       0 (84,000,000) (377,000,000)      
Retained Earnings (Accumulated Deficit) | IPALCO Enterprises, Inc. [Member]                                  
Noncontrolling Interest [Line Items]                                  
Sale of subsidiary shares to noncontrolling interests                 $ (84,000,000)   $ (377,000,000)   (84,000,000) [1] (377,000,000) [1]      
Noncontrolling Interest [Member]                                  
Noncontrolling Interest [Line Items]                                  
Sale of subsidiary shares to noncontrolling interests                       $ 83,000,000 $ 17,000,000 $ 119,000,000      
Mitsui Ltd [Member] | IPP4 [Member]                                  
Noncontrolling Interest [Line Items]                                  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                         40.00%        
Nebras Power Q.S.C [Member] | IPP4 [Member]                                  
Noncontrolling Interest [Line Items]                                  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                         24.00%        
[1] See Note 17—Redeemable stock of subsidiaries for further information on increase in paid-in-capital transferred to redeemable stock of subsidiaries.