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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Carrying Value $ 113,234 $ 116,273
Short-term borrowings, Carrying Value 2,160 2,334
Long-term borrowings, Carrying Value 109,586 112,368
Total interest-bearing liabilities, Carrying Value 111,746 114,702
Total earning assets, Fair Value 112,616 115,020
Short-term borrowings, Fair Value 2,169 2,346
Long-term borrowings, Fair Value 107,743 109,826
Total interest-bearing liabilities, Fair Value 109,912 112,172
FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 85,284 87,730
Loans receivable, Fair Value 84,531 86,626
Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (164) (184)
Derivative financial instruments, Fair Value (164) (184)
Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 277 357
Derivative financial instruments, Fair Value 277 357
Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (1,166) (1,296)
Derivative financial instruments, Fair Value (1,166) (1,296)
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (16) (13)
Derivative financial instruments, Fair Value (16) (13)
Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 22,552 23,340
Loans receivable, Fair Value 22,687 23,191
Difference [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Fair Value (618) (1,253)
Short-term borrowings, Fair Value (9) (12)
Long-term borrowings, Fair Value 1,843 2,542
Total interest-bearing liabilities, Fair Value 1,834 2,530
Excess of net asset fair value over carrying value 1,216 1,277
Difference [Member] | FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (753) (1,104)
Difference [Member] | Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value 135 (149)
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 5,398 5,203
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments $ 5,398 $ 5,203