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Borrowings - Long-Term Borrowings (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term borrowings $ 136,648 $ 152,401
Weighted Average Interest Rate 1.63% 1.57%
Long-term borrowings, Average Balance 138,682 151,397
U.S. Dollar-Denominated Interest Bearing, Due 2015-2048 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 96,724  
Weighted Average Interest Rate 0.99%  
Long-term borrowings, Average Balance 102,241  
Non-U.S. Dollar-Denominated Interest Bearing, Due 2021-2041 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 9,249 10,819
Weighted Average Interest Rate 0.62% 0.53%
Long-term borrowings, Average Balance 9,525 11,463
Total Floating Rate Notes [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 105,973 123,227
Weighted Average Interest Rate 0.96% 1.00%
Long-term borrowings, Average Balance 111,766 124,699
U.S. Dollar Denominated Interest Bearing, Due 2015-2047 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 18,510  
Weighted Average Interest Rate 5.61%  
Long-term borrowings, Average Balance 16,149  
Non-U.S. Dollar Denominated Interest Bearing, Due 2015-2039 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 3,204  
Weighted Average Interest Rate 2.72%  
Long-term borrowings, Average Balance 2,420  
Total Fixed Rate Notes [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 21,714 20,157
Weighted Average Interest Rate 5.18% 5.13%
Long-term borrowings, Average Balance 18,569 17,085
Brokered Deposits - U.S. Dollar-Denominated, Due 2015-2018 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 2,807  
Weighted Average Interest Rate 1.32%  
Long-term borrowings, Average Balance 2,488  
U.S. Dollar-Denominated Interest Bearing, Due 2014-2048 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings   112,408
Weighted Average Interest Rate   1.04%
Long-term borrowings, Average Balance   113,236
U.S. Dollar-Denominated Interest Bearing, Due 2014-2046 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings   16,096
Weighted Average Interest Rate   5.57%
Long-term borrowings, Average Balance   14,203
Non-U.S.-Dollar Denominated Interest Bearing, Due 2014-2039 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings   4,061
Weighted Average Interest Rate   3.39%
Long-term borrowings, Average Balance   2,882
Brokered Deposits - U.S. Dollar-Denominated, Due 2014-2017 [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings   3,120
Weighted Average Interest Rate   1.77%
Long-term borrowings, Average Balance   2,216
FFELP Loans - Other Facilities [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 5,311 4,827
Weighted Average Interest Rate 0.76% 1.29%
Long-term borrowings, Average Balance 5,504 5,517
Private Education Loans - Other Facilities [Member]
    
Debt Instrument [Line Items]    
Long-term borrowings 843 1,070
Weighted Average Interest Rate 0.96% 1.45%
Long-term borrowings, Average Balance $ 355 $ 1,880