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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Carrying Value $ 122,894 $ 128,725
Short-term borrowings, Carrying Value 2,370 2,570
Long-term borrowings, Carrying Value 119,637 124,833
Total interest-bearing liabilities, Carrying Value 122,007 127,403
Total earning assets, Fair Value 120,384 125,982
Short-term borrowings, Fair Value 2,376 2,569
Long-term borrowings, Fair Value 113,665 118,471
Total interest-bearing liabilities, Fair Value 116,041 121,040
Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (406) (365)
Derivative financial instruments, Fair Value (406) (365)
Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 753 566
Derivative financial instruments, Fair Value 753 566
Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (842) (986)
Derivative financial instruments, Fair Value (842) (986)
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (7) (2)
Derivative financial instruments, Fair Value (7) (2)
FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 92,618 96,498
Loans receivable, Fair Value 90,723 94,377
Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 24,741 26,394
Loans receivable, Fair Value 24,126 25,772
Difference [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Fair Value (2,510) (2,743)
Short-term borrowings, Fair Value (6) 1
Long-term borrowings, Fair Value 5,972 6,362
Total interest-bearing liabilities, Fair Value 5,966 6,363
Excess of net asset fair value over carrying value 3,456 3,620
Difference [Member] | FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (1,895) (2,121)
Difference [Member] | Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (615) (622)
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 5,535 5,833
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments $ 5,535 $ 5,833