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Other Assets - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Cross-currency interest rate swaps designated as fair value hedges	$ 1.6	$ 2.4
Cumulative mark-to-market adjustment to the hedged debt	$ (2.1)	$ (2.8)

X

- Definition

Cross-currency interest rate swaps designated as fair value hedges.

+ References

No definition available.

+ Details

Name:	navi_CrossCurrencyInterestRateSwapsDesignatedAsFairValueHedges
Namespace Prefix:	navi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cumulative mark-to-market adjustment to the hedged debt.

+ References

No definition available.

+ Details

Name:	navi_CumulativeMarkToMarketAdjustmentToHedgedDebt
Namespace Prefix:	navi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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