Leverage ratio before collateral release date.

No definition available.

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

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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.

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+ Details

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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

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+ Details

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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

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+ Details

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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

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Namespace Prefix:	us-gaap_
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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

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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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Debt Obligations - New TRGP Credit Agreement - Additional Information (Details) - New TRGP Credit Agreement [Member] - USD ($)		12 Months Ended
	Feb. 20, 2025	Dec. 31, 2024	Feb. 18, 2025
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio before collateral release date		1
Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio before collateral release date		5.5
Debt Rating [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.10%
Debt Rating [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.275%
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] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Term SOFR [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.625%
Term SOFR [Member] \| SOFR Adjustment For Term SOFR Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Base Rate [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Base Rate [Member] \| Non-Credit-Enhanced Senior Unsecured Long-Term Debt Ratings [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.625%
Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity			$ 3,500,000,000
Maximum borrowing capacity			500,000,000
Remaining borrowing capacity			$ 150,000,000
Maturity date	Feb. 18, 2030