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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total earning assets, Carrying Value $ 70,130 $ 76,657  
Short-term borrowings, Carrying Value 5,677 2,490  
Long-term borrowings, Carrying Value 63,998 74,488  
Total 69,675 76,978  
Total earning assets, Fair Value 67,002 78,617  
Short-term borrowings, Fair Value 5,684 2,492  
Long-term borrowings, Fair Value 60,787 74,548  
Total interest-bearing liabilities, Fair Value 66,471 77,040  
FFELP Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans, Carrying Value 46,891 52,641  
Loans receivable, Fair Value 44,627 53,632  
Floor Income Contracts [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative financial instruments, Carrying Value   (65)  
Derivative financial instruments, Fair Value   (65)  
Interest Rate Swaps [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative financial instruments, Carrying Value 47 219  
Derivative financial instruments, Fair Value 47 219  
Cross-Currency Interest Rate Swaps [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative financial instruments, Carrying Value (407) (190)  
Derivative financial instruments, Fair Value (407) (190)  
Private Education Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans, Carrying Value 19,151 20,171 $ 20,018
Loans receivable, Fair Value 18,287 21,140  
Difference [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total earning assets, Fair Value (3,128) 1,960  
Short-term borrowings, Fair Value (7) (2)  
Long-term borrowings, Fair Value 3,211 (60)  
Total interest-bearing liabilities, Fair Value 3,204 (62)  
Excess of net asset fair value over carrying value 76 1,898  
Difference [Member] | FFELP Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans receivable, Fair Value (2,264) 991  
Difference [Member] | Private Education Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans receivable, Fair Value (864) 969  
Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and investments 4,088 3,845  
Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and investments $ 4,088 $ 3,845