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Student Loans - Student Loan Portfolio by Program (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Balance of student loans	$ 142,100	$ 162,546
Percentage to total student loans	100.00%	100.00%
Average Balance student loans	150,444	169,815
Average Effective Interest Rate of student loans	3.56%	3.38%
FFELP Stafford and Other Student Loans, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Balance of student loans	40,021	44,289
Percentage to total student loans	28.00%	27.00%
Average Balance student loans	42,039	47,629
Average Effective Interest Rate of student loans	2.01%	1.98%
FFELP Consolidation Loans, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Balance of student loans	64,567	81,323
Percentage to total student loans	46.00%	50.00%
Average Balance student loans	70,113	84,495
Average Effective Interest Rate of student loans	2.82%	2.73%
Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Balance of student loans	37,512	36,934
Percentage to total student loans	26.00%	23.00%
Average Balance student loans	$ 38,292	$ 37,691
Average Effective Interest Rate of student loans	6.60%	6.58%

X

- Definition

Represents the average effective interest rate of outstanding student loans for the period end.

+ References

No definition available.

+ Details

Name:	navi_AverageEffectiveInterestRateOfStudentLoans
Namespace Prefix:	navi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the average balance of outstanding student loans during the period presented.

+ References

No definition available.

+ Details

Name:	navi_AverageOutstandingStudentLoans
Namespace Prefix:	navi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage to total student loans.

+ References

No definition available.

+ Details

Name:	navi_PercentageToStudentLoans
Namespace Prefix:	navi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LoansReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant