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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Carrying Value $ 120,038 $ 128,725
Short-term borrowings, Carrying Value 2,637 2,570
Long-term borrowings, Carrying Value 116,540 124,833
Total interest-bearing liabilities, Carrying Value 119,177 127,403
Total earning assets, Fair Value 118,345 125,982
Short-term borrowings, Fair Value 2,648 2,569
Long-term borrowings, Fair Value 112,258 118,471
Total interest-bearing liabilities, Fair Value 114,906 121,040
Floor Income Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (293) (365)
Derivative financial instruments, Fair Value (293) (365)
Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value 658 566
Derivative financial instruments, Fair Value 658 566
Cross-Currency Interest Rate Swaps [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (724) (986)
Derivative financial instruments, Fair Value (724) (986)
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Carrying Value (10) (2)
Derivative financial instruments, Fair Value (10) (2)
FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 90,146 96,498
Loans receivable, Fair Value 88,765 94,377
Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Carrying Value 24,010 26,394
Loans receivable, Fair Value 23,698 25,772
Difference [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total earning assets, Fair Value (1,693) (2,743)
Short-term borrowings, Fair Value (11) 1
Long-term borrowings, Fair Value 4,282 6,362
Total interest-bearing liabilities, Fair Value 4,271 6,363
Excess of net asset fair value over carrying value 2,578 3,620
Difference [Member] | FFELP Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (1,381) (2,121)
Difference [Member] | Private Education Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, Fair Value (312) (622)
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments 5,882 5,833
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and investments $ 5,882 $ 5,833