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Debt (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2011
M
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2012
Short-term Debt [Line Items]            
Short-term borrowings $ 3,424,000,000 $ 3,414,000,000        
Debt (Textuals) [Abstract]            
Principal outstanding of Subordinated Debentures 750,000,000          
Interest rate of convertible subordinated debt over LIBOR 2.23%          
Interest rate of convertible subordinated debt LIBOR rate plus an annual percentage after year five following the balance sheet date LIBOR + 2.23%          
Convertible Subordinated Debentures Redeemable Percentage Of Principal 100.00%          
Percentage of Tangible Common Equity To Total Adjusted Assets less than 4 percent          
Number of months prior to trigger determination date decline in tangible common equity 18          
Percentage of Decline in Tangible Common Equity 10.00%          
Total bank lines of credit of the company 7,500,000,000 10,600,000,000        
Unutilized total credit lines 2,900,000,000 6,500,000,000        
Fees to maintain credit lines 22,200,000,000 7,700,000,000        
Lines of credit facility remaining borrowing capacity supporting commercial paper borrowings 2,900,000,000 5,700,000,000        
Line of Credit Facility financial covenants consolidated tangible net worth required 4,100,000,000          
Line of credit facility financial covenants combined earnings and fixed charges to fixed charges ratio required 0.0125          
Total Interest Paid 2,400,000,000 2,400,000,000 2,300,000,000      
Line of credit facility expiration amount       2,600,000,000 2,000,000,000 2,900,000,000
Face amount of eligible notes issued from the Charge Trust     3,000,000,000      
Face amount of eligible notes draw downs $ 3,000,000,000          
Convertible Subordinated Debt [Member]
            
Debt Instrument [Line Items]            
Year-End Stated Rate on Debt 6.80%