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Document and Entity Information
Oct. 18, 2019
Document And Entity Information [Line Items]  
Entity Registrant Name NAVIENT CORP
Amendment Flag false
Entity Central Index Key 0001593538
Document Type 8-K
Document Period End Date Oct. 18, 2019
Entity Incorporation State Country Code DE
Entity File Number 001-36228
Entity Tax Identification Number 46-4054283
Entity Address, Address Line One 123 Justison Street
Entity Address, City or Town Wilmington
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19801
City Area Code (302)
Local Phone Number 283-8000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock Par Value .01 Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common stock, par value $.01 per share
Trading Symbol NAVI
Security Exchange Name NASDAQ
Senior Notes [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 6% Senior Notes due December 15, 2043
Trading Symbol JSM
Security Exchange Name NASDAQ