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Borrowings - Financing VIEs (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Securities Financing Transaction [Line Items]    
Short-term borrowings $ 4,068 $ 6,613
Long-term borrowings 75,814 77,332
Total 79,882 83,945
Total assets 83,348 87,412
Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 4,038 6,609
Long-term borrowings 75,340 76,781
Total 79,378 83,390
Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 30 4
Long-term borrowings 474 551
Total 504 555
Assets and Liabilities of Consolidated Variable Interest Entities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 2,026 5,595
Long-term borrowings 68,850 68,900
Total 70,876 74,495
Loans 72,552 76,726
Cash 2,275 2,322
Other assets, Net 1,579 1,420
Total assets 76,406 80,468
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings 54,000 54,697
Total 54,000 54,697
Loans 54,773 55,535
Cash 1,641 1,606
Other assets, Net 1,479 1,438
Total assets 57,893 58,579
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 832 960
Long-term borrowings 13,154 13,891
Total 13,986 14,851
Loans 14,830 15,823
Cash 551 606
Other assets, Net 172 187
Total assets 15,553 16,616
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan ABCP Facilities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings   2,053
Long-term borrowings 462 479
Total 462 2,532
Loans 455 2,533
Cash 9 36
Other assets, Net 17 76
Total assets 481 2,645
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan ABCP Facilities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 1,194 2,582
Long-term borrowings 1,259  
Total 2,453 2,582
Loans 2,494 2,835
Cash 74 74
Other assets, Net 27 27
Total assets 2,595 2,936
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 2,026 5,595
Long-term borrowings 68,875 69,067
Total 70,901 74,662
Loans 72,552 76,726
Cash 2,275 2,322
Other assets, Net 1,695 1,728
Total assets 76,522 80,776
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings (25) (167)
Total (25) (167)
Other assets, Net (116) (308)
Total assets $ (116) $ (308)