Assets Recorded As Finance Lease Sold, Consideration

No definition available.

Name:	fro_AssetsRecordedAsFinanceLeaseSoldConsideration
Namespace Prefix:	fro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contract Termination Receivable

+ References

No definition available.

+ Details

Name:	fro_ContractTerminationReceivable
Namespace Prefix:	fro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gain On Pooling Arrangements

+ References

No definition available.

+ Details

Name:	fro_GainOnPoolingArrangements
Namespace Prefix:	fro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Gain On Settlement Of Other Claims

+ References

No definition available.

+ Details

Name:	fro_GainOnSettlementOfOtherClaims
Namespace Prefix:	fro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number Of Vessels Sold Recorded As Investment In Finance Lease

+ References

No definition available.

+ Details

Name:	fro_NumberOfVesselsSoldRecordedAsInvestmentInFinanceLease
Namespace Prefix:	fro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_GainLossOnContractTermination
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=fro_InvestmentInFinanceLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fro_ShipFinanceInternationalLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

OTHER OPERATING GAINS - Narrative (Details) $ in Thousands	1 Months Ended			6 Months Ended
OTHER OPERATING GAINS - Narrative (Details) $ in Thousands	Apr. 30, 2020 USD ($) very_large_crude_carrier	Mar. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Gain on settlement of claim		$ 3,400		$ 0	$ 3,422
Gain on sale of vessel				0	12,354
Gain on pooling arrangements				1,000	800
Gain on miscellaneous settlements				$ 100	$ 300
Investment In Finance Lease
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of vessels sold recorded as investment in finance lease \| very_large_crude_carrier	1
Purchase price consideration	$ 25,500
Gain on sale of vessel	$ 12,400
SFL
Revenues from External Customers and Long-Lived Assets [Line Items]
Compensation received on termination of contract			$ 3,200
Gain on contract termination			$ 7,400