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Subsequent Event Subsequent Event (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Apr. 17, 2015
Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Future sale of Private Education Loans |  | $ 753 us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Gain on sale of loans, net of costs and adjustments | $ 78 us-gaap_GainLossOnSalesOfLoansNet / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Percentage of premium on loan sale |  | 1050.00%slm_Percentageofpremiumonloansale / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Percentage of premium on loan sale + References No definition available. + Details
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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=13989330&loc=d3e107314-111719 + Details
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Period Type: | instant

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Details
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