Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited, consolidated financial statements of Navient have been prepared in accordance with generally accepted accounting principles in the United States of America (GAAP) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. The consolidated financial statements include the accounts of Navient and its majority-owned and controlled subsidiaries and those Variable Interest Entities (VIEs) for which we are the primary beneficiary, after eliminating the effects of intercompany accounts and transactions. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods have been included. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Operating results for the three and six months ended June 30, 2026 are not necessarily indicative of the results for the year ending December 31, 2026 or for any other period. These unaudited financial statements should be read in conjunction with the audited financial statements and related notes included in our 2025 Form 10-K. Definitions for certain capitalized terms used but not otherwise defined in this Form 10-Q can be found in our 2025 Form 10-K.
Loans Held for Sale	Loans Held for Sale Loans are classified as held-for-sale when we have the intent and ability to sell such loans, On June 30, 2026, $528 million of Private Education Loans were classified as held for sale. When loans are classified as held for sale the corresponding allowance for loan losses is reversed and such loans are carried at the lower of fair value or cost basis. These loans had $19 million of allowance for loan loss reversed through provision and are carried at their cost basis as of June 30, 2026. Associated premium, discount and capitalized origination costs are not amortized into interest income for loans classified as held-for-sale. Election of Fair Value Option – In School Private Education Loans Effective July 1, 2026, the Company elected the fair value option available under ASC Topic 825, "Financial Instruments," to account for In School Private Education Loans originated on or after that date. Accordingly, these loans will be recorded at fair value with remeasurement each reporting period to the then current fair value of the loans. These adjustments to fair value will be recognized in current period earnings in the Income Statement. Prior to this election, upon origination, In School Private Education Loans were accounted for at amortized cost, which required an allowance for loan losses to be recorded, through provision for loan losses, that covered lifetime expected credit losses under the CECL methodology. The Company believes that applying the fair value option, rather than the amortized cost methodology, to these loans better aligns the accounting with how we manage and evaluate these loans as well as more accurately reflecting the economic value of the loans.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2026

The accompanying unaudited, consolidated financial statements of Navient have been prepared in accordance with generally accepted accounting principles in the United States of America (GAAP) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. The consolidated financial statements include the accounts of Navient and its majority-owned and controlled subsidiaries and those Variable Interest Entities (VIEs) for which we are the primary beneficiary, after eliminating the effects of intercompany accounts and transactions. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods have been included. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Operating results for the three and six months ended June 30, 2026 are not necessarily indicative of the results for the year ending December 31, 2026 or for any other period. These unaudited financial statements should be read in conjunction with the audited financial statements and related notes included in our 2025 Form 10-K. Definitions for certain capitalized terms used but not otherwise defined in this Form 10-Q can be found in our 2025 Form 10-K.

Loans Held for Sale

Loans are classified as held-for-sale when we have the intent and ability to sell such loans, On June 30, 2026, $528 million of Private Education Loans were classified as held for sale. When loans are classified as held for sale the corresponding allowance for loan losses is reversed and such loans are carried at the lower of fair value or cost basis. These loans had $19 million of allowance for loan loss reversed through provision and are carried at their cost basis as of June 30, 2026. Associated premium, discount and capitalized origination costs are not amortized into interest income for loans classified as held-for-sale.

Election of Fair Value Option – In School Private Education Loans

Effective July 1, 2026, the Company elected the fair value option available under ASC Topic 825, "Financial Instruments," to account for In School Private Education Loans originated on or after that date. Accordingly, these loans will be recorded at fair value with remeasurement each reporting period to the then current fair value of the loans. These adjustments to fair value will be recognized in current period earnings in the Income Statement. Prior to this election, upon origination, In School Private Education Loans were accounted for at amortized cost, which required an allowance for loan losses to be recorded, through provision for loan losses, that covered lifetime expected credit losses under the CECL methodology. The Company believes that applying the fair value option, rather than the amortized cost methodology, to these loans better aligns the accounting with how we manage and evaluate these loans as well as more accurately reflecting the economic value of the loans.