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Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   $ 27,338,000,000 $ 27,230,000,000
Intangible assets subject to amortization   1,361,000,000 1,546,000,000
Total   1,361,000,000 1,546,000,000
Goodwill [Line Items]      
Goodwill   27,338,000,000 27,230,000,000
Acquisitions   0  
Dispositions, currency exchange and other   108,000,000  
Goodwill, period increase (decrease)   108,000,000  
Discount rates used in reporting unit valuations minimum rate 11.00%    
Discount rates used in reporting unit valuations maximum rate 12.75%    
Discount Rate Goodwill Impairment 11.00%    
Currency Exchange Effect On Goodwill [Member]
     
Goodwill [Line Items]      
Goodwill, period increase (decrease)   173,000,000  
Commercial Real Estate Portfolio Segment [Member]
     
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill 970,000,000    
Goodwill [Line Items]      
Goodwill 970,000,000    
Amount Carrying Value Exceeds Estimated Fair Value 1,800,000,000    
Implied Fair Value Of Goodwill Exceeding Carrying Value Of Goodwill 1,700,000,000    
Real Estate Equity Investments [Member]
     
Goodwill [Line Items]      
Amount Carrying Value Exceeds Estimated Fair Value 2,600,000,000    
CLL [Member]
     
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   13,775,000,000 13,745,000,000
Goodwill [Line Items]      
Goodwill   13,775,000,000 13,745,000,000
Acquisitions   0  
Dispositions, currency exchange and other   30,000,000  
Consumer [Member]
     
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   10,893,000,000 10,775,000,000
Goodwill [Line Items]      
Goodwill   10,893,000,000 10,775,000,000
Acquisitions   0  
Dispositions, currency exchange and other   118,000,000  
Real Estate [Member]
     
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   961,000,000 1,001,000,000
Goodwill [Line Items]      
Goodwill   961,000,000 1,001,000,000
Acquisitions   0  
Dispositions, currency exchange and other   (40,000,000)  
Energy Financial Services [Member]
     
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   1,562,000,000 1,562,000,000
Goodwill [Line Items]      
Goodwill   1,562,000,000 1,562,000,000
Acquisitions   0  
Dispositions, currency exchange and other   0  
GECAS [Member]
     
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   147,000,000 147,000,000
Goodwill [Line Items]      
Goodwill   147,000,000 147,000,000
Acquisitions   0  
Dispositions, currency exchange and other   $ 0