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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |