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Debt Obligations - Summary of Payment Obligations for Debt Instruments (Details) $ in Millions | Jun. 30, 2020 USD ($)
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Debt Instrument [Line Items] |  |
Total | $ 10,103.1 |
Less Than 1 Year | 407.2 |
1-3 Years | 2,252.5 |
3-5 Years | 2,293.8 |
More Than 5 Years | 5,149.6 |
Long Term Debt Obligation [Member] |  |
Debt Instrument [Line Items] |  |
Total | 7,599.9 | [1]
1-3 Years | 1,441.1 | [1]
3-5 Years | 1,693.1 | [1]
More Than 5 Years | 4,465.7 | [1]
Interest On Debt Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Total | 2,503.2 | [2]
Less Than 1 Year | 407.2 | [2]
1-3 Years | 811.4 | [2]
3-5 Years | 600.7 | [2]
More Than 5 Years | $ 683.9 | [2]
[1] | Represents scheduled future maturities of consolidated debt obligations for the periods indicated.
[2] | Represents interest expense on debt obligations based on both fixed debt interest rates and prevailing June 30, 2020 rates for floating debt.

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the fourth and fifth fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthAndFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the second and third fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondAndThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=trgp_LongTermDebtObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=trgp_InterestOnDebtObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |