Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Registrant Name	Navient Corporation
Entity Central Index Key	0001593538
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		112,749,884
Entity Public Float			$ 1.7
Entity File Number	001-36228
Entity Tax Identification Number	46-4054283
Entity Address, Address Line One	13865 Sunrise Valley Drive
Entity Address, City or Town	Herndon
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20171
City Area Code	703
Local Phone Number	810-3000
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	Portions of the proxy statement (the “2024 Proxy Statement”) relating to the Registrant’s 2024 Annual Meeting of Shareholders, to be filed no later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Auditor Firm ID	185
Auditor Name	KPMG LLP
Auditor Location	McLean, VA
Common Stock Par Value. 01 Per Share [Member]
Document Information [Line Items]
Title of 12(b) Security	Common stock, par value $.01 per share
Trading Symbol	NAVI
Security Exchange Name	NASDAQ
Senior Notes Due December 15, 2043 [Member]
Document Information [Line Items]
Title of 12(b) Security	6% Senior Notes due December 15, 2043
Trading Symbol	JSM
Security Exchange Name	NASDAQ
Preferred Stock Purchase Rights [Member]
Document Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
Trading Symbol	None
Security Exchange Name	NASDAQ