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Borrowings - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 19, 2020 | Feb. 12, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Feb. 20, 2019
Line of Credit Facility [Line Items] |  |  |  |  |
Short-term borrowings |  |  | $ 0 | $ 289,230,000 |
Unsecured offering issued |  |  | $ 636,000,000 | $ 1,110,000,000 |
Estimated weighted average life of student loans |  |  | 5 years 3 months 18 days | 5 years 4 months 24 days |
Uncommitted federal funds |  |  | $ 125,000,000 |  |
Lendable value of collateral |  |  | 2,400,000,000 | $ 3,200,000,000 |
Unsecured borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Short-term borrowings |  |  | 0 | 0 |
Private Education Loans 2019 Term A |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total loan amount securitized at inception |  | $ 636,000,000 |  |  |
Amount of loan securitization sold to third parties |  | $ 636,000,000 |  |  |
Ownership interest percentage |  | 100.00% |  |  |
Proceeds from loan securitization sold to third parties |  | $ 634,000,000 |  |  |
Loans pledged as collateral |  |  | 665,000,000 |  |
Principal amount of collateral |  |  | 622,000,000 |  |
Capitalized interest |  |  | 43,000,000 |  |
Class A and B Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Estimated weighted average life of student loans |  | 4 years 2 months 4 days |  |  |
Class A and B Notes | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 0.88% |  |  |
Commercial Paper | ABCP borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Private asset backed commercial paper education loan funding facility | $ 2,000,000,000 |  |  |  | $ 750,000,000
Ownership interest percentage in residual interest in ABCP facility | 100.00% |  |  |  |
Short-term borrowings |  |  | $ 0 | $ 289,000,000 |

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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5086-111524 + Details
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