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Acquisitions, Goodwill and Other Intangible Assets (Goodwill Impairment) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Goodwill [Line Items]      
Goodwill $ 69,988 $ 65,526  
Upper Limit      
Goodwill [Line Items]      
Fair Value Inputs Discount Rate 16.50%    
Lower Limit      
Goodwill [Line Items]      
Fair Value Inputs Discount Rate 9.50%    
Energy Financial Services      
Goodwill [Line Items]      
Fair Value Inputs Discount Rate 10.00%    
Percentage of Fair value in Excess of Carrying amount 2.00% 12.00% 13.00%
Percentage Of Total Company Goodwill 2.00%    
Implied Fair Value Of Goodwill Exceeding Carrying Value Of Goodwill $ 670    
Goodwill $ 1,386    
Hydro      
Goodwill [Line Items]      
Percentage Of Total Company Goodwill 1.00%    
Goodwill $ 756    
Grid      
Goodwill [Line Items]      
Percentage of Fair value in Excess of Carrying amount 3.00%    
Percentage Of Total Company Goodwill 5.00%    
Goodwill $ 3,586    
Power Conversion      
Goodwill [Line Items]      
Reporting units impacted by acqusition of Alstom 2    
Reporting units added after acquisition of Alstom 2    
Percentage of Fair value in Excess of Carrying amount 9.00%    
Percentage Of Total Company Goodwill 2.00%    
Goodwill $ 1,154