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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Carrying Value $ 94,168 $ 99,986
Short-term borrowings, Carrying Value 6,785 5,422
Long-term borrowings, Carrying Value 86,776 93,519
Total 93,561 98,941
Total earning assets, Fair Value 95,338 100,520
Short-term borrowings, Fair Value 6,812 5,418
Long-term borrowings, Fair Value 86,412 92,173
Total interest-bearing liabilities, Fair Value 93,224 97,591
FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 67,956 72,253
Loans receivable, Fair Value 68,378 72,074
Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (99) (53)
Derivative financial instruments, Fair Value (99) (53)
Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 219 94
Derivative financial instruments, Fair Value 219 94
Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (603) (659)
Derivative financial instruments, Fair Value (603) (659)
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (2) (4)
Derivative financial instruments, Fair Value (2) (4)
Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 21,564 22,245
Loans receivable, Fair Value 22,312 22,958
Difference [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Fair Value 1,170 534
Short-term borrowings, Fair Value (27) 4
Long-term borrowings, Fair Value 364 1,346
Total interest-bearing liabilities, Fair Value 337 1,350
Excess of net asset fair value over carrying value 1,507 1,884
Difference [Member] | FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value 422 (179)
Difference [Member] | Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value 748 713
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 4,648 5,488
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments $ 4,648 $ 5,488