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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 28, 2017
Feb. 18, 2016
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Mar. 31, 2016
Noncontrolling Interest [Line Items]                    
Temporary Equity, Net Income             $ 9,000,000 $ 8,000,000    
Noncontrolling Interest, Increase from Sale of Parent Equity Interest             (69,000,000) (17,000,000)    
Additional Paid in Capital     $ 8,670,000,000       $ 8,670,000,000   $ 8,592,000,000  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     6.70%       6.70%      
Stockholders' Equity Attributable to Parent     $ 3,186,000,000       $ 3,186,000,000   $ 2,794,000,000  
Loss (gain) on sales and disposals of businesses     1,000,000   $ 0   49,000,000 (30,000,000)    
Dominican Republic [Member]                    
Noncontrolling Interest [Line Items]                    
Proceeds from Divestiture of Businesses $ 60,000,000                  
Gain on Disposition of Stock in Subsidiary, Recorded to APIC     $ 25,000,000              
Noncontrolling Interest, Increase from Sale of Parent Equity Interest             $ (25,000,000)      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     5.00%       5.00%      
Loss (gain) on sales and disposals of businesses             $ 0      
Alto Maipo [Member]                    
Noncontrolling Interest [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired     40.00%       40.00%      
Noncontrolling Interest, Ownership Percentage by Parent     62.00%       62.00%      
Additional Paid in Capital     $ 229,000,000       $ 229,000,000      
Stockholders' Equity Attributable to Parent     $ 196,000,000       $ 196,000,000      
Loss (gain) on sales and disposals of businesses       $ 0            
IPP4 [Member]                    
Noncontrolling Interest [Line Items]                    
Noncontrolling Interest, Ownership Percentage by Parent                   36.00%
UK Wind Projects [Member]                    
Noncontrolling Interest [Line Items]                    
Loss (gain) on sales and disposals of businesses           $ 20,000,000        
Jordan [Member]                    
Noncontrolling Interest [Line Items]                    
Disposal Group Not Discontinued Operation Ownership Interest Sold   40.00%                
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds   $ 21,000,000                
Loss (gain) on sales and disposals of businesses   $ (4,000,000)                
Additional Paid-in Capital [Member] | IPALCO Enterprises, Inc. [Member]                    
Noncontrolling Interest [Line Items]                    
Noncontrolling Interest, Increase from Sale of Parent Equity Interest               $ (84,000,000)    
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%