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Borrowings - Company's Borrowings (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Long Term And Short Term Debt [Line Items]    
Short-term borrowings $ 13,795 $ 19,856
Long-term borrowings 136,648 152,401
Total 150,443 172,257
Senior Unsecured Debt [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 2,213 2,319
Long-term borrowings 16,056 15,446
Total 18,269 17,765
Bank Deposits [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 6,133 4,226
Long-term borrowings 2,807 3,088
Total 8,940 7,314
Other [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 691 1,609
Total 691 1,609
Total Unsecured Borrowings [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 9,037 8,154
Long-term borrowings 18,863 18,534
Total 27,900 26,688
FFELP Loan Securitizations [Member]
    
Long Term And Short Term Debt [Line Items]    
Long-term borrowings 90,756 105,525
Total 90,756 105,525
Private Education Loan Securitizations [Member]
    
Long Term And Short Term Debt [Line Items]    
Long-term borrowings 18,835 19,656
Total 18,835 19,656
FFELP Loans - Other Facilities [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 4,715 11,651
Long-term borrowings 5,311 4,827
Total 10,026 16,478
Private Education Loans - Other Facilities [Member]
    
Long Term And Short Term Debt [Line Items]    
Long-term borrowings 843 1,070
Total 843 1,070
Total Secured Borrowings [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 4,715 11,651
Long-term borrowings 115,745 131,078
Total 120,460 142,729
Total Before Hedge Accounting Adjustments [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 13,752 19,805
Long-term borrowings 134,608 149,612
Total 148,360 169,417
Hedge Accounting Adjustments [Member]
    
Long Term And Short Term Debt [Line Items]    
Short-term borrowings 43 51
Long-term borrowings 2,040 2,789
Total $ 2,083 $ 2,840