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Earnings per Common Share (Parenthetical) (Details) - Series A Preferred Stock [Member] $ in Millions	1 Months Ended
	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

X

- 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

X

- 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

X

- 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

X

- Details

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