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Allowance for Loan Losses - Accrued Interest Receivable (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	$ 374	$ 433
Greater Than 90 Days Past Due	23	27
Allowance for Uncollectible Interest	26	26
Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	48	57
Greater Than 90 Days Past Due	7	8
Allowance for Uncollectible Interest	7	9
Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	422	490
Greater Than 90 Days Past Due	30	35
Allowance for Uncollectible Interest	$ 33	$ 35

X

- Definition

Accrued interest on loans greater than ninety days past due.

+ References

No definition available.

+ Details

Name:	navi_AccruedInterestOnLoansGreaterThanNinetyDaysPastDue
Namespace Prefix:	navi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the allowance for uncollectible accrued interest receivable on Private Education Loans.

+ References

No definition available.

+ Details

Name:	navi_AllowanceForUncollectibleAccruedInterest
Namespace Prefix:	navi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=navi_PrivateEducationLoansTraditionalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=navi_PrivateEducationLoansNonTraditionalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=navi_PrivateEducationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: