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Borrowings - Company's Borrowings (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Short-term borrowings $ 4,752 $ 5,134
Long-term borrowings 42,345 43,184
Total 47,097 48,318
Total Before Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 4,755 5,139
Long-term borrowings 42,408 43,526
Total 47,163 48,665
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 505 553
Long-term borrowings 4,798 4,806
Total 5,303 5,359
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 505 553
Long-term borrowings 4,798 4,806
Total 5,303 5,359
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 117 41
Long-term borrowings 26,948 28,268
Total 27,065 28,309
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 562 631
Long-term borrowings 10,322 10,338
Total 10,884 10,969
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan ABCP Facilities [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,531 1,586
Long-term borrowings 301 74
Total 1,832 1,660
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan ABCP Facilities [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,943 2,274
Long-term borrowings 0 0
Total 1,943 2,274
Total Before Hedge Accounting Adjustments [Member] | Other [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 97 54
Long-term borrowings 39 40
Total 136 94
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 4,250 4,586
Long-term borrowings 37,610 38,720
Total 41,860 43,306
Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings (3) (5)
Long-term borrowings (63) (342)
Total $ (66) $ (347)