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Earnings per Common Share (Parenthetical) (Details) - Series A Preferred Stock [Member] $ in Millions | 1 Months Ended
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Dec. 31, 2020 USD ($)
Earnings Per Common Share [Line Items] |
Dividends paid upon partial repurchase of shares | $ 1.1
Deemed dividend on partial repurchase of shares | $ 1.6

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- Definition Accumulated and unpaid dividends. + References No definition available. + Details
Name: | trgp_AccumulatedAndUnpaidDividends
Namespace Prefix: | trgp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deemed dividend on partial repurchase of shares. + References No definition available. + Details
Name: | trgp_DeemedDividendOnPartialRepurchaseOfShares
Namespace Prefix: | trgp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Earnings Per common share. + References No definition available. + Details
Name: | trgp_EarningsPerCommonShareLineItems
Namespace Prefix: | trgp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |