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Borrowings - Financing VIEs (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Securities Financing Transaction [Line Items]    
Short-term borrowings $ 13,795 $ 19,856
Long-term borrowings 136,648 152,401
Total 150,443 172,257
Cash 3,650 5,011
Other assets 7,287 8,273
Assets and Liabilities of Consolidated Variable Interest Entities [Member]
    
Securities Financing Transaction [Line Items]    
Short-term borrowings 3,655 9,551
Long-term borrowings 115,538 131,518
Total 119,193 141,069
Loans 124,784 147,131
Cash 3,395 4,826
Other assets 2,322 2,312
Total Carrying Amount of Assets Securing Debt Outstanding 130,501 154,269
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member]
    
Securities Financing Transaction [Line Items]    
Long-term borrowings 90,756 105,525
Total 90,756 105,525
Loans 91,535 107,009
Cash 2,913 3,652
Other assets 683 608
Total Carrying Amount of Assets Securing Debt Outstanding 95,131 111,269
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member]
    
Securities Financing Transaction [Line Items]    
Long-term borrowings 18,835 19,656
Total 18,835 19,656
Loans 23,947 24,618
Cash 338 385
Other assets 540 545
Total Carrying Amount of Assets Securing Debt Outstanding 24,825 25,548
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loans - Other Facilities [Member]
    
Securities Financing Transaction [Line Items]    
Short-term borrowings 3,655 9,551
Long-term borrowings 3,791 4,154
Total 7,446 13,705
Loans 7,719 14,050
Cash 128 487
Other assets 91 197
Total Carrying Amount of Assets Securing Debt Outstanding 7,938 14,734
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loans - Other Facilities [Member]
    
Securities Financing Transaction [Line Items]    
Long-term borrowings 843 1,070
Total 843 1,070
Loans 1,583 1,454
Cash 16 302
Other assets 30 33
Total Carrying Amount of Assets Securing Debt Outstanding 1,629 1,789
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member]
    
Securities Financing Transaction [Line Items]    
Short-term borrowings 3,655 9,551
Long-term borrowings 114,225 130,405
Total 117,880 139,956
Loans 124,784 147,131
Cash 3,395 4,826
Other assets 1,344 1,383
Total Carrying Amount of Assets Securing Debt Outstanding 129,523 153,340
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member]
    
Securities Financing Transaction [Line Items]    
Long-term borrowings 1,313 1,113
Total 1,313 1,113
Other assets 978 929
Total Carrying Amount of Assets Securing Debt Outstanding $ 978 $ 929