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Property, Plant and Equipment (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment              
Original cost $ 87,332   $ 87,332   $ 84,070    
Accumulated depreciation and amortization (36,628)   (36,628)   (35,734)    
Depreciation and amortization 1,278 $ 1,424 3,603 $ 3,820     $ 3,674
Property, Plant and Equipment, Net [1] 50,704   50,704   48,336    
Subsidiaries GECC [Member]              
Property, Plant and Equipment              
Impairment of Long-Lived Assets Held-for-use         0 $ 0  
Amortization of Leased Asset         1,668 1,773 $ 1,789
Property, Plant and Equipment, Net [1] $ 34,516   $ 34,516   31,519    
Equipment Leased to Other Party [Member]              
Property, Plant and Equipment              
Original cost         0 0  
Accumulated depreciation and amortization         $ 0 $ 0  
[1] Amounts may not add due to rounding.