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Document and Entity Information Document
Feb. 18, 2021
Feb. 12, 2020
Entity Information [Line Items]    
Document Type 8-K  
Document Period End Date Feb. 18, 2021  
Entity Registrant Name   SLM CORP
Entity Central Index Key 0001032033  
Amendment Flag false  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-13251  
Entity Tax Identification Number 52-2013874  
Entity Address, Address Line One 300 Continental Drive  
Entity Address, City or Town Newark,  
Entity Address, State or Province DE  
Entity Address, Postal Zip Code 19713  
City Area Code 302  
Local Phone Number 451-0200  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Common Class A [Member]    
Entity Information [Line Items]    
Title of 12(b) Security Common stock, par value $.20 per share  
Trading Symbol SLM  
Security Exchange Name NASDAQ  
Noncumulative Preferred Stock [Member]    
Entity Information [Line Items]    
Title of 12(b) Security Floating Rate Non-Cumulative Preferred Stock, Series B, par value $.20 per share  
Trading Symbol SLMBP  
Security Exchange Name NASDAQ