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Derivative Instruments and Hedging Activities, Pro Forma Impact - Offsetting Collateral (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivative Asset [Abstract]
Gross collateral	$ 30.2	$ 3.5
Counterparties with Offsetting Positions or Collateral [Member]
Derivative Asset [Abstract]
Gross collateral	30.2	3.5
Current Assets from Risk Management Activities [Member]
Derivative Asset [Abstract]
Gross collateral	23.5	3.6
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]
Derivative Asset [Abstract]
Gross collateral	23.5	3.6
Other Long-term Assets [Member]
Derivative Asset [Abstract]
Gross collateral	6.7	(0.1)
Other Long-term Assets [Member] | Counterparties with Offsetting Positions or Collateral [Member]
Derivative Asset [Abstract]
Gross collateral	$ 6.7	$ (0.1)

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- Definition

Derivative collateral obligation (right) to return (reclaim) securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	trgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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