| Disclosure Descriptive Information |
| Label: | Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
| Name: | FairValueAssetsMeasuredonRecurringBasisUnobservableInputReconciliationCalculationRollForward |
| Parent Topic: | FairValueMeasurement |
| Documentation: | Disclosure of information about fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period. |
| Commentary: | |
| Status: | |
| US GAAP XBRL Taxonomy Text Block: | us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock |
| Human Readable Examples: | List of human readable examples |
| Machine Readable Examples: | List of machine readable examples |
| Business rules (machine readable): | XBRL Definition Relations |
| US GAAP XBRL Taxonomy Network: | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures | XML | HTML |
| References to Accounting Standards Codification (ASC) |
| Item | Description | Reference |
|---|---|---|
| 1 | FASB: Topic:820 Subtopic:10 Section:50 Paragraph:2 Subparagraph:(c) | http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 |
| 2 | FASB: Topic:820 Subtopic:10 Section:50 Paragraph:3 | http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 |
| Example Disclosure |
| Prototype of Disclosure |
| Line | Label | Object Class (Data type) | Period Type | Balance | Report Element Name |
|---|---|---|---|---|---|
| 1 | Fair Value Measurements | Abstract | us-gaap:FairValueDisclosuresAbstract | ||
| 2 | Reconciliation of items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3) | Abstract | us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward | ||
| 3 | Balance at the beginning of the period | Concept (Monetary) | As Of | Debit | us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |
| 4 | Total gains or losses included in earnings | Concept (Monetary) | For Period | Credit | us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 |
| 5 | Total gains or losses included in other comprehensive income | Concept (Monetary) | For Period | Credit | us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss |
| 6 | Purchases, issuances, and settlements | Concept (Monetary) | For Period | Debit | us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements |
| 7 | Transfers in and/or out of Level 3 | Concept (Monetary) | For Period | Debit | us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet |
| 8 | Balance at the end of the period | Concept (Monetary) | As Of | Debit | us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |
| 9 | Change in unrealized gains or losses for the period included in earnings for securities held at the end of the reporting period | Concept (Monetary) | For Period | Credit | us-gaap:FairValueInstrumentsClassifiedInShareholdersEquityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss |
| Business Rules Summary |
| From | Arcrole (predicate) | To |
|---|---|---|
| disclosures:FairValueAssetsMeasuredonRecurringBasisUnobservableInputReconciliationCalculationRollForward | rules-arcroles:disclosure-equivalentTextblock | us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock |
| disclosures:FairValueAssetsMeasuredonRecurringBasisUnobservableInputReconciliationCalculationRollForward | rules-arcroles:disclosure-hasConceptArrangementPattern | fro:RollForward |
| disclosures:FairValueAssetsMeasuredonRecurringBasisUnobservableInputReconciliationCalculationRollForward | rules-arcroles:disclosure-requiresConcept | us-gaap:FairValueInstrumentsClassifiedInShareholdersEquityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss |
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