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Subsequent Events (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2017 | Feb. 08, 2017 | Feb. 25, 2016 | Jul. 30, 2015 | Dec. 31, 2015 | Oct. 12, 2016 | Jul. 21, 2016 | May 26, 2016 | Oct. 27, 2015 | Apr. 23, 2015 | Dec. 19, 2014
Private Education Loans |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans sold to third parties |  |  |  | $ 631,000,000 |  |  |  |  | $ 701,000,000 | $ 738,000,000 |
Private education loan term accounted for as a secured financing |  |  |  | 714,000,000 |  | $ 674,000,000 | $ 657,000,000 | $ 551,000,000 |  |  |
Gross profit raised from loans sold to third parties |  |  |  | $ 623,000,000 |  |  |  |  |  |  |
Residual Certificates |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  |  |  | 100.00% |  |  | 100.00% | 100.00% |  |  |
Subsequent Event | Private Education Loans |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans sold to third parties |  | $ 772,000,000 |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  | $ 772,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Residual Certificates |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  | 100.00% |  |  |  |  |  |  |  |  |
Subsequent Event | Private Education Loans, 2017 Term A |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit raised from loans sold to third parties |  | $ 768,000,000 |  |  |  |  |  |  |  |  |
Commercial Paper | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Private education loan funding |  |  | $ 750,000,000.0 |  |  |  |  |  |  |  | $ 750,000,000.0
Unused borrowing capacity fee (as a percent) |  |  |  |  | 0.40% |  |  |  |  |  |
Commercial Paper | Subsequent Event | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Private education loan funding | $ 750,000,000.0 |  |  |  |  |  |  |  |  |  |
Minimum | Commercial Paper | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused borrowing capacity fee (as a percent) |  |  | 0.35% |  |  |  |  |  |  |  |
Minimum | Commercial Paper | Subsequent Event | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused borrowing capacity fee (as a percent) | 0.35% |  |  |  |  |  |  |  |  |  |
Maximum | Commercial Paper | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused borrowing capacity fee (as a percent) |  |  | 0.45% |  |  |  |  |  |  |  |
Maximum | Commercial Paper | Subsequent Event | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused borrowing capacity fee (as a percent) | 0.45% |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Commercial Paper | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.90% |  | 0.80% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Commercial Paper | Subsequent Event | ABCP borrowings |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.90% |  |  |  |  |  |  |  |  |  |

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- Definition Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719 + Details
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- Definition This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719 + Details
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