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GECS Revenues from Services (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Subsidiary Revenue From Services [Line Items]    
Total$ 11,673$ 11,585$ 36,485$ 35,775
Net other-than-temporary impairments on investment securities  186166
Subsidiaries GECS [Member]
    
Subsidiary Revenue From Services [Line Items]    
Interest On Loans5,0424,97115,20715,492
Equipment leased to others2,8552,7998,5298,329
Fees1,2271,1803,5313,555
Investment Income5835952,0041,668
Financing leases5546781,8372,105
Premiums earned by insurance activities4655111,4371,490
Real estate investments3793301,211961
Associated companies3894911,9971,548
Other items4923591,6331,582
Total11,98611,91437,38636,730
Net other-than-temporary impairments on investment securities6831  
Subsidiaries GECS [Member] | Garanti Bank [Member]
    
Subsidiary Revenue From Services [Line Items]    
Equity Interest Percentage Sold18.60% 18.60% 
Gain (Loss) on Sale of Equity Investments  $ 690 
Equity Method Investment, Ownership Percentage2.25% 2.25%