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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Carrying Value $ 85,373 $ 90,812
Short-term borrowings, Carrying Value 7,078 8,483
Long-term borrowings, Carrying Value 79,137 81,715
Total 86,215 90,198
Total earning assets, Fair Value 87,285 91,454
Short-term borrowings, Fair Value 7,078 8,498
Long-term borrowings, Fair Value 77,343 81,317
Total interest-bearing liabilities, Fair Value 84,421 89,815
FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 59,559 64,575
Loans receivable, Fair Value 59,954 64,478
Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (225) (68)
Derivative financial instruments, Fair Value (225) (68)
Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 348 210
Derivative financial instruments, Fair Value 348 210
Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (461) (575)
Derivative financial instruments, Fair Value (461) (575)
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value   (1)
Derivative financial instruments, Fair Value   (1)
Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 21,289 22,245
Loans receivable, Fair Value 22,806 22,984
Difference [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Fair Value 1,912 642
Short-term borrowings, Fair Value   (15)
Long-term borrowings, Fair Value 1,794 398
Total interest-bearing liabilities, Fair Value 1,794 383
Excess of net asset fair value over carrying value 3,706 1,025
Difference [Member] | FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value 395 (97)
Difference [Member] | Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value 1,517 739
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 4,525 3,992
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments $ 4,525 $ 3,992