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Subsequent Events (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 02, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]          
EP Preferred shares percentage with preference to exercise withdrawal rights   2.70%   2.70%  
Gain (Loss) on Disposition of Business   $ (1) $ 0 $ (49) $ 30
EP Preferred shares with preference to exercise withdrawal rights   3   3  
Eletropaulo [Domain]          
Subsequent Event [Line Items]          
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax       $ 452  
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits       $ 243  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Sale of Stock, Percentage of Ownership before Transaction 100.00%        
Gain (Loss) on Disposition of Business $ 37