Interest coverage ratio.

No definition available.

Name:	trgp_InterestCoverageRatio
Namespace Prefix:	trgp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Leverage ratio before collateral release date.

+ References

No definition available.

+ Details

Name:	trgp_LeverageRatioBeforeCollateralReleaseDate
Namespace Prefix:	trgp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=trgp_TRCCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=trgp_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=trgp_TermSOFRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=trgp_SOFRAdjustmentForTermSOFRLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=trgp_LeverageRatioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=trgp_DebtRatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=trgp_NonCreditEnhancedSeniorUnsecuredLongTermDebtRatingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt Obligations - New TRC Credit Agreement - Additional Information (Details) - New TRP Revolver [Member] - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Term SOFR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Term SOFR [Member] \| SOFR Adjustment For Term SOFR Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio before collateral release date		1.00
Interest coverage ratio		1.00
Minimum [Member] \| Leverage Ratio [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.20%
Minimum [Member] \| Debt Rating [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.125%
Minimum [Member] \| Term SOFR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Minimum [Member] \| Term SOFR [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.125%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.25%
Minimum [Member] \| Base Rate [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.125%
Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio before collateral release date		5.50
Interest coverage ratio		2.25
Maximum [Member] \| Leverage Ratio [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.35%
Maximum [Member] \| Debt Rating [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.35%
Maximum [Member] \| Term SOFR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Maximum [Member] \| Term SOFR [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Maximum [Member] \| Base Rate [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Scenario Forecast [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 2,750,000,000
Maximum borrowing capacity	500,000,000.0
Remaining borrowing capacity	$ 100,000,000.0
Maturity date	Feb. 17, 2027