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Borrowings - Outstanding Short-Term Borrowings (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]    
Maximum outstanding at any month end $ 20,038 $ 29,160
Short-term borrowings, Ending Balance 13,795 19,856
Weighted Average Interest Rate 1.09% 1.25%
Short-term borrowings, Average Balance 16,730 24,831
Weighted Average Interest Rate, Average Balance 1.46% 1.19%
Bank Deposits [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings, Ending Balance 6,133 4,226
Weighted Average Interest Rate 1.14% 1.40%
Short-term borrowings, Average Balance 5,221 3,537
Weighted Average Interest Rate, Average Balance 1.44% 1.54%
FFELP Loans - Other Facilities [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings, Ending Balance 4,715 11,651
Weighted Average Interest Rate 0.21% 0.72%
Short-term borrowings, Average Balance 7,386 17,606
Weighted Average Interest Rate, Average Balance 0.84% 0.78%
Senior Unsecured Debt [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings, Ending Balance 2,256 2,370
Weighted Average Interest Rate 3.09% 4.24%
Short-term borrowings, Average Balance 2,814 2,214
Weighted Average Interest Rate, Average Balance 3.59% 4.49%
Other Interest Bearing Liabilities [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings, Ending Balance 691 1,609
Weighted Average Interest Rate 0.07% 0.31%
Short-term borrowings, Average Balance 1,037 1,474
Weighted Average Interest Rate, Average Balance 0.14% 0.21%
Private Education Loans - Other Facilities [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings, Average Balance $ 272  
Weighted Average Interest Rate, Average Balance 1.86%