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Borrowings - Financing VIEs (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Securities Financing Transaction [Line Items]    
Short-term borrowings $ 2,160 $ 2,334
Long-term borrowings 109,586 112,368
Total Debt Outstanding 111,746 114,702
Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 2,161 2,335
Long-term borrowings 110,223 113,119
Total Debt Outstanding 112,384 115,454
Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings (1) (1)
Long-term borrowings (637) (751)
Total Debt Outstanding (638) (752)
Assets and Liabilities of Consolidated Variable Interest Entities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 1,177 1,078
Long-term borrowings 92,559 95,492
Total Debt Outstanding 93,736 96,570
Loans 100,883 104,008
Cash 3,556 3,434
Other assets, Net 95 (11)
Total Carrying Amount of Assets Securing Debt Outstanding 104,534 107,431
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings 73,047 73,522
Total Debt Outstanding 73,047 73,522
Loans 73,669 74,197
Cash 2,764 2,676
Other assets, Net 818 778
Total Carrying Amount of Assets Securing Debt Outstanding 77,251 77,651
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 548 548
Long-term borrowings 13,343 14,125
Total Debt Outstanding 13,891 14,673
Loans 19,030 19,815
Cash 490 455
Other assets, Net 243 260
Total Carrying Amount of Assets Securing Debt Outstanding 19,763 20,530
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings 7,208 9,046
Total Debt Outstanding 7,208 9,046
Loans 7,295 9,232
Cash 279 289
Other assets, Net 158 172
Total Carrying Amount of Assets Securing Debt Outstanding 7,732 9,693
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan - Other Facilities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 540 464
Total Debt Outstanding 540 464
Loans 785 685
Cash 17 10
Other assets, Net 13 14
Total Carrying Amount of Assets Securing Debt Outstanding 815 709
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 1,177 1,078
Long-term borrowings 93,598 96,693
Total Debt Outstanding 94,775 97,771
Loans 100,883 104,008
Cash 3,556 3,434
Other assets, Net 1,231 1,224
Total Carrying Amount of Assets Securing Debt Outstanding 105,670 108,666
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings (1,039) (1,201)
Total Debt Outstanding (1,039) (1,201)
Other assets, Net (1,136) (1,235)
Total Carrying Amount of Assets Securing Debt Outstanding (1,136) (1,235)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Other [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 89 66
Total Debt Outstanding 89 66
Loans 104 79
Cash 6 4
Other assets, Net (1)  
Total Carrying Amount of Assets Securing Debt Outstanding $ 109 $ 83