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Long-Term Borrowings (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Unsecured long-term borrowings by maturity date    
2014 $ 22,775  
2015 21,145  
2016 21,889  
2017 20,712  
2018-thereafter 80,784  
Unsecured long-term borrowings 167,305 173,545
Group Inc. [Member]
   
Unsecured long-term borrowings by maturity date    
2014 22,279  
2015 20,734  
2016 21,717  
2017 20,218  
2018-thereafter 73,731  
Unsecured long-term borrowings 158,679 166,222
Subsidiaries [Member]
   
Unsecured long-term borrowings by maturity date    
2014 496  
2015 411  
2016 172  
2017 494  
2018-thereafter 7,053  
Unsecured long-term borrowings $ 8,626 $ 7,323