XML 92 R98.htm IDEA: XBRL DOCUMENT v2.4.0.8

Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	$ 151,698	$ 171,117
Total interest-bearing liabilities	147,385	166,071
Fair Value [Member] | Floor Income Contracts [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	(1,384)	(2,154)
Fair Value [Member] | Interest Rate Swaps [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	459	1,337
Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	999	1,099
Fair Value [Member] | Other [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	(21)	4
Fair Value [Member] | Short-Term Borrowings [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total interest-bearing liabilities	13,807	19,861
Fair Value [Member] | Long-Term Borrowings [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total interest-bearing liabilities	133,578	146,210
Fair Value [Member] | FFELP Loans [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	104,481	125,042
Fair Value [Member] | Private Education Loans [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	37,485	36,081
Fair Value [Member] | Cash and Investments [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	9,732	9,994
Carrying Value [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	151,832	172,540
Total interest-bearing liabilities	150,443	172,257
Carrying Value [Member] | Floor Income Contracts [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	(1,384)	(2,154)
Carrying Value [Member] | Interest Rate Swaps [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	459	1,337
Carrying Value [Member] | Cross-Currency Interest Rate Swaps [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	999	1,099
Carrying Value [Member] | Other [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Derivative financial instruments	(21)	4
Carrying Value [Member] | Short-Term Borrowings [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total interest-bearing liabilities	13,795	19,856
Carrying Value [Member] | Long-Term Borrowings [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total interest-bearing liabilities	136,648	152,401
Carrying Value [Member] | FFELP Loans [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	104,588	125,612
Carrying Value [Member] | Private Education Loans [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	37,512	36,934
Carrying Value [Member] | Cash and Investments [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	9,732	9,994
Difference [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	(134)	(1,423)
Total interest-bearing liabilities	3,058	6,186
Excess of net asset fair value over carrying value	2,924	4,763
Difference [Member] | Short-Term Borrowings [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total interest-bearing liabilities	(12)	(5)
Difference [Member] | Long-Term Borrowings [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total interest-bearing liabilities	3,070	6,191
Difference [Member] | FFELP Loans [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	(107)	(570)
Difference [Member] | Private Education Loans [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Total earning assets	$ (27)	$ (853)

X

- Definition

Total earning assets.

+ References

No definition available.

+ Details

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

X

- Definition

Excess of net asset fair value over carrying value.

+ References

No definition available.

+ Details

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

X

- Details

Name:	navi_FairValuesOfFinancialAssetsAndLiabilitiesIncludingDerivativeFinancialInstrumentsLineItems
Namespace Prefix:	navi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total interest-bearing liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

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