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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans $ 54,827 $ 62,250
Total earning assets, Carrying Value 57,766 67,224
Short-term borrowings, Carrying Value 4,226 5,870
Long-term borrowings, Carrying Value 53,402 61,026
Total 57,628 66,896
Total earning assets, Fair Value 55,816 64,280
Short-term borrowings, Fair Value 4,237 5,879
Long-term borrowings, Fair Value 51,566 57,652
Total interest-bearing liabilities, Fair Value 55,803 63,531
FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 37,925 43,525
Loans receivable, Fair Value 36,590 41,426
Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 0 0
Derivative financial instruments, Fair Value 0 0
Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 54 51
Derivative financial instruments, Fair Value 54 51
Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (189) (253)
Derivative financial instruments, Fair Value (189) (253)
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 0 0
Derivative financial instruments, Fair Value 0 0
Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 16,902 18,725
Loans receivable, Fair Value 16,287 17,880
Difference [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 0 0
Total earning assets, Fair Value (1,950) (2,944)
Short-term borrowings, Fair Value (11) (9)
Long-term borrowings, Fair Value 1,836 3,374
Total interest-bearing liabilities, Fair Value 1,825 3,365
Excess of net asset fair value over carrying value (125) 421
Difference [Member] | FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (1,335) (2,099)
Difference [Member] | Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Fair Value 0 0
Difference [Member] | Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Fair Value 0 0
Difference [Member] | Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Fair Value 0 0
Difference [Member] | Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Fair Value 0 0
Difference [Member] | Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (615) (845)
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 2,939 4,974
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments $ 2,939 $ 4,974