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Document and Entity Information
 6 Months Ended
Jun. 30, 2019
shares
Document And Entity Information [Abstract]  
Document Type 10-Q
Amendment Flag false
Document Period End Date Jun. 30, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q2
Trading Symbol NAVI
Entity Registrant Name NAVIENT CORP
Entity Central Index Key 0001593538
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 230,494,278
Entity Current Reporting Status Yes
Entity Shell Company false
Entity File Number 001-36228
Entity Tax Identification Number 464054283
Entity Address, Address Line One 123 Justison Street
Entity Address, City or Town Wilmington
Entity Address, State or Province Delaware
Entity Address, Postal Zip Code 19801
City Area Code (302) 
Local Phone Number 283-8000