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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total earning assets, Carrying Value $ 53,316 $ 57,766  
Short-term borrowings, Carrying Value 5,326 4,226  
Long-term borrowings, Carrying Value 47,545 53,402  
Total 52,871 57,628  
Total earning assets, Fair Value 52,394 55,816  
Short-term borrowings, Fair Value 5,348 4,237  
Long-term borrowings, Fair Value 46,274 51,566  
Total interest-bearing liabilities, Fair Value 51,622 55,803  
FFELP Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans, Carrying Value 32,940 37,925  
Loans receivable, Fair Value 32,555 36,590  
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 31 54  
Derivative financial instruments, Fair Value 31 54  
Cross-Currency Interest Rate Swaps [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative financial instruments, Carrying Value (222) (189)  
Derivative financial instruments, Fair Value (222) (189)  
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, Carrying Value 16,238 16,902 $ 17,732
Loans receivable, Fair Value 15,701 16,287  
Difference [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and investments 0 0  
Total earning assets, Fair Value (922) (1,950)  
Short-term borrowings, Fair Value (22) (11)  
Long-term borrowings, Fair Value 1,271 1,836  
Total interest-bearing liabilities, Fair Value 1,249 1,825  
Excess of net asset fair value over carrying value 327 (125)  
Difference [Member] | FFELP Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans receivable, Fair Value (385) (1,335)  
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 (537) (615)  
Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and investments 4,138 2,939  
Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and investments $ 4,138 $ 2,939