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v3.21.2

Subsequent Events (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 20, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Subsequent Event [Line Items] |  |  |  |  |
Remaining authority under the share repurchase program |  | $ 51,000,000 |  | $ 51,000,000 |
Declared dividends per common share attributable to SLM Corporation (in dollars per share) |  | $ 0.03 | $ 0 | $ 0.09 | $ 0.09
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Declared dividends per common share attributable to SLM Corporation (in dollars per share) | $ 0.11 |  |  |  |
2021 Share Repurchase Program | Common Stock |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Remaining authority under the share repurchase program |  | $ 51,000,000 |  | $ 51,000,000 |
2021 Share Repurchase Program | Common Stock | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Increase in amount of common stock that may be repurchased | $ 250,000,000 |  |  |  |

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- Definition Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased + References No definition available. + Details
Name: | slm_StockRepurchaseProgramNumberOfAdditionalSharesAuthorizedToBeRepurchased
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |