XML 62 R49.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Derivative Financial Instruments - Credit Exposure Related Counterparties (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative Instruments Gain Loss [Line Items] |  |
Exposure, net of collateral | $ 7 | $ 9
Exposure, net of collateral | 0 | $ 0
Corporate Contracts [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Exposure, net of collateral | $ 7 |
Percent of exposure to counterparties with credit ratings below S&P AA- or Moody’s Aa3 | 100.00% |

X
- Definition Percent Of Exposure To Counterparties With Credit Ratings Below S&P AA Or Moody Aa3. + References No definition available. + Details
Name: | navi_PercentOfExposureToCounterpartiesWithCreditRatingsBelowSPAAOrMoodyAa3
Namespace Prefix: | navi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 + Details
Name: | us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value as of the balance sheet date of all derivatives designated as foreign currency fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126966630&loc=d3e41228-113958 + Details
Name: | us-gaap_ForeignCurrencyFairValueHedgeDerivativeAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=navi_CorporateContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |