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Borrowings - Financing VIEs (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Securities Financing Transaction [Line Items]    
Short-term borrowings $ 5,677 $ 2,490
Long-term borrowings 63,998 74,488
Total 69,675 76,978
Total assets 73,625 80,605
Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 5,692 2,490
Long-term borrowings 64,658 74,231
Total 70,350 76,721
Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings (15)  
Long-term borrowings (660) 257
Total (675) 257
Assets and Liabilities of Consolidated Variable Interest Entities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 4,288 2,188
Long-term borrowings 58,587 67,107
Total 62,875 69,295
Loans 64,111 70,649
Cash 2,511 2,649
Other assets 1,396 1,522
Total assets 68,018 74,820
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 83  
Long-term borrowings 45,358 51,841
Total 45,441 51,841
Loans 45,484 52,066
Cash 2,029 2,073
Other assets 1,636 1,520
Total assets 49,149 55,659
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 813 543
Long-term borrowings 13,300 14,074
Total 14,113 14,617
Loans 14,739 15,506
Cash 371 505
Other assets 100 150
Total assets 15,210 16,161
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan ABCP Facilities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 974 282
Long-term borrowings 291 150
Total 1,265 432
Loans 1,269 436
Cash 27 8
Other assets 43 15
Total assets 1,339 459
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan ABCP Facilities [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 2,418 1,363
Long-term borrowings   1,152
Total 2,418 2,515
Loans 2,619 2,641
Cash 84 63
Other assets 26 32
Total assets 2,729 2,736
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Short-term borrowings 4,288 2,188
Long-term borrowings 58,949 67,217
Total 63,237 69,405
Loans 64,111 70,649
Cash 2,511 2,649
Other assets 1,805 1,717
Total assets 68,427 75,015
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member]    
Securities Financing Transaction [Line Items]    
Long-term borrowings (362) (110)
Total (362) (110)
Other assets (409) (195)
Total assets $ (409) $ (195)