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v3.3.1.900

Borrowings - Additional (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 27, 2015 | Apr. 23, 2015 | Dec. 19, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Secured borrowings |  |  | $ 0 |  |  |
Amount drawn and outstanding under ABCP facility |  | $ 500,175,000 |  |  |  |
Discretionary uncommitted federal funds line of credit |  | 100,000,000 |  |  |  |
Lendable value of collateral |  | $ 1,700,000,000 | $ 1,400,000,000 |  |  |
Estimated weighted average life of student loans |  | 6 years 2 months 6 days | 6 years 2 months 12 days |  |  |
Private Education Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loan term accounted for as a secured financing | $ 714,000,000 |  |  |  |  |
Loans sold to third parties | 630,800,000 |  |  | $ 701,000,000 | $ 738,000,000 |
Gross profit raised from loans sold to third parties | $ 623,000,000 |  |  |  |  |
Loans pledged as collateral |  | $ 687,300,000 |  |  |  |
Class A and B Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Ownership interest percentage on asset-backed financing | 5.00% |  |  |  |  |
Ownership interest amount of securitized or asset backed loan | $ 33,000,000 |  |  |  |  |
Estimated weighted average life of student loans | 4 years 9 months 18 days |  |  |  |  |
Class C Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Ownership interest percentage on asset-backed financing | 100.00% |  |  |  |  |
Ownership interest amount of securitized or asset backed loan | $ 50,000,000 |  |  |  |  |
Residual Certificates |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Ownership interest percentage on asset-backed financing | 100.00% |  |  |  |  |
ABCP borrowings |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Contractual maturity related to ABCP facility |  | 2 years |  |  |  |
Revolving period of contractual maturity |  | 1 year |  |  |  |
Amortization period of contractual maturity |  | 1 year |  |  |  |
Amount drawn and outstanding under ABCP facility |  | $ 500,175,000 |  |  |  |
Loans pledged as collateral |  | $ 923,700,000 |  |  |  |
London Interbank Offered Rate (LIBOR) | Class A and B Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.53% |  |  |  |  |
Commercial Paper | ABCP borrowings |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loan funding |  |  |  |  |  | $ 750,000,000
Ownership interest retained in ABCP facility (as a percent) |  | 5.00% |  |  |  | 5.00%
Line of Credit, Required Ownership Interest |  |  |  |  |  | $ 37,500,000
Funds available to draw |  |  |  |  |  | $ 712,500,000
Unused borrowing capacity fee (as a percent) |  | 0.40% |  |  |  |
Commercial Paper | London Interbank Offered Rate (LIBOR) | ABCP borrowings |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 0.80% |  |  |  |

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