XML 78 R59.htm IDEA: XBRL DOCUMENT v3.20.4

Joint Ventures and Divestitures - Additional Information Divestitures (Details) - USD ($) $ in Millions		1 Months Ended				12 Months Ended
	Sep. 30, 2018	Oct. 31, 2020	Apr. 30, 2019	Feb. 28, 2019	May 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 01, 2019	Feb. 06, 2018
Assets And Liabilities Held For Sale [Line Items]
(Gain) loss on sale or disposition of business and assets						$ 58.4	$ 71.1	$ (0.1)
Fractionation-related infrastructure funded and owned percentage										100.00%
Sale price of Delaware crude system									$ 134.0
Proceeds from sale of business and assets						$ 198.7	14.8	256.9
Train 7 Joint Venture [Member] | Fractionation Related Infrastructure [Member] | Targa Resources Corp [Member]
Assets And Liabilities Held For Sale [Line Items]
Fractionation-related infrastructure funded and owned percentage				100.00%
Versado Gathering System [Member]
Assets And Liabilities Held For Sale [Line Items]
(Gain) loss on sale or disposition of business and assets								(44.4)
Other Operating Income (Expense) [Member]
Assets And Liabilities Held For Sale [Line Items]
Gain (loss) on sale or disposal of assets							$ (59.5)
Targa Badlands LLC [Member]
Assets And Liabilities Held For Sale [Line Items]
Option to purchase equity interest percentage			7.50%
Subsidiary ownership interest sale percentage			45.00%
Consideration received on sale of interest on subsidiary			$ 1,600.0
Channelview, Texas [Member]
Assets And Liabilities Held For Sale [Line Items]
Proceeds from sale of business and assets		$ 58.0
Channelview, Texas [Member] | Other Operating Income (Expense) [Member]
Assets And Liabilities Held For Sale [Line Items]
(Gain) loss on sale or disposition of business and assets		$ 58.3
Refined Products And Crude Oil Storage And Terminaling Facilities [Member] | Tacoma, Washington and Baltimore, Maryland [Member]
Assets And Liabilities Held For Sale [Line Items]
Proceeds from sale of property	$ 165.0
Refined Products And Crude Oil Storage And Terminaling Facilities [Member] | Tacoma, Washington and Baltimore, Maryland [Member] | Other Operating Income (Expense) [Member]
Assets And Liabilities Held For Sale [Line Items]
Gain (loss) on sale or disposal of assets	$ (59.1)
Train 7 [Member]
Assets And Liabilities Held For Sale [Line Items]
Option to purchase equity interest percentage				20.00%
Logistics and Transportation [Member]
Assets And Liabilities Held For Sale [Line Items]
Proceeds from sale of property					$ 69.3
Gain Loss On Sale Of Business								$ 48.1

X

- Definition

Assets and liabilities held for sale.

+ References

No definition available.

+ Details

Name:	trgp_AssetsAndLiabilitiesHeldForSaleLineItems
Namespace Prefix:	trgp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fractionation-related infrastructure funded and owned percentage.

+ References

No definition available.

+ Details

Name:	trgp_FractionationRelatedInfrastructureFundedAndOwnedPercentage
Namespace Prefix:	trgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Option to purchase equity interest percentage.

+ References

No definition available.

+ Details

Name:	trgp_OptionToPurchaseEquityInterestPercentage
Namespace Prefix:	trgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Sale price of Delaware crude system.

+ References

No definition available.

+ Details

Name:	trgp_SalePriceOfDelawareCrudeSystem
Namespace Prefix:	trgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The selling price of property, plant, and equipment.

+ References

No definition available.

+ Details

Name:	trgp_SellingPriceOfInlandMarineBargeBusiness
Namespace Prefix:	trgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Subsidiary ownership interest sale percentage.

+ References

No definition available.

+ Details

Name:	trgp_SubsidiaryOwnershipInterestSalePercentage
Namespace Prefix:	trgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

+ Details

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

X

- Definition

Amount of gain (loss) on sale or disposal of oil and gas property or 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_GainLossOnSaleOfProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=trgp_TrainSevenJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=trgp_FractionationRelatedInfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=trgp_TargaResourcesCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=trgp_VersadoGatheringSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherOperatingIncomeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=trgp_TargaBadlandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=trgp_ChannelviewTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_StatementGeographicalAxis=trgp_TacomaWashingtonAndBaltimoreMarylandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=trgp_LogisticsAndTransportationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: