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Borrowings - Financing VIEs (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Securities Financing Transaction [Line Items]    
Short-term borrowings $ 2,637 $ 2,570
Long-term borrowings 116,540 124,833
Total Debt Outstanding 119,177 127,403
Other assets 4,591 4,682
Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 2,637 2,590
Long-term borrowings 116,291 124,916
Total Debt Outstanding 118,928 127,506
Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings   (20)
Long-term borrowings 249 (83)
Total Debt Outstanding 249 (103)
Assets and Liabilities of Consolidated Variable Interest Entities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 381 710
Long-term borrowings 99,027 106,510
Total Debt Outstanding 99,408 107,220
Loans 106,150 114,640
Cash 3,437 3,553
Other assets 553 293
Total Carrying Amount of Assets Securing Debt Outstanding 110,140 118,486
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings 74,269 77,764
Total Debt Outstanding 74,269 77,764
Loans 74,813 78,358
Cash 2,723 2,760
Other assets 784 682
Total Carrying Amount of Assets Securing Debt Outstanding 78,320 81,800
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings 15,402 16,900
Total Debt Outstanding 15,402 16,900
Loans 20,505 22,014
Cash 447 452
Other assets 282 323
Total Carrying Amount of Assets Securing Debt Outstanding 21,234 22,789
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings 10,071 12,676
Total Debt Outstanding 10,071 12,676
Loans 10,266 13,158
Cash 258 324
Other assets 172 168
Total Carrying Amount of Assets Securing Debt Outstanding 10,696 13,650
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan - Other Facilities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 344 710
Total Debt Outstanding 344 710
Loans 520 1,110
Cash 8 17
Other assets 16 31
Total Carrying Amount of Assets Securing Debt Outstanding 544 1,158
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 381 710
Long-term borrowings 99,742 107,340
Total Debt Outstanding 100,123 108,050
Loans 106,150 114,640
Cash 3,437 3,553
Other assets 1,253 1,204
Total Carrying Amount of Assets Securing Debt Outstanding 110,840 119,397
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings (715) (830)
Total Debt Outstanding (715) (830)
Other assets (700) (911)
Total Carrying Amount of Assets Securing Debt Outstanding (700) $ (911)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Other [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 37  
Total Debt Outstanding 37  
Loans 46  
Cash 1  
Other assets (1)  
Total Carrying Amount of Assets Securing Debt Outstanding $ 46