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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 17, 2021 | Apr. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2021 | Feb. 28, 2021 | Feb. 22, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings under accounts receivable securitization facility |  |  |  |  | $ 530,000,000.0 | $ 226,400,000 |  |  |  |
Accounts receivable securitization facility | [1],[2] |  |  | $ 360,000,000.0 | 360,000,000.0 |  | $ 350,000,000.0 |  |  |
Senior Unsecured 4¼% Notes due November 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  | Nov. 30, 2023 | May 17, 2021 |  |  |  |  |  |  |
Interest rate on fixed rate debt |  | 4.25% | 4.25% |  |  |  |  |  |  |
Accounts Receivable Securitization Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | Apr. 21, 2022 |  |  |  |  |  |
Proceeds from borrowings under accounts receivable securitization facility |  |  |  |  | 360,000,000.0 |  |  |  |  |
Accounts receivable securitization facility |  |  |  | $ 400,000,000.0 | 400,000,000.0 |  |  |  |  |
Maximum borrowing capacity |  |  |  | 400,000,000.0 | 400,000,000.0 |  |  | $ 350,000,000.0 |  |
Remaining borrowing capacity |  |  |  | 40,000,000.0 | $ 40,000,000.0 |  |  |  |  |
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due June 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jun. 30, 2023 |  | Jun. 30, 2023 |  |  |
Maximum borrowing capacity |  |  |  | 670,000,000.0 | $ 670,000,000.0 |  |  |  |  |
Remaining borrowing capacity |  |  |  | $ 670,000,000.0 | $ 670,000,000.0 |  |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  |  |  |  | 5.125% |
Senior Unsecured Notes [Member] | Senior Unsecured of 4% Senior Notes due January 2032 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jan. 31, 2032 |  | Jan. 31, 2032 |  |  |
Interest rate on fixed rate debt |  |  |  | 4.00% | 4.00% |  | 4.00% |  |  |
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5⅞% Notes due August 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Aug. 31, 2023 |  | Aug. 31, 2023 |  |  |
Interest rate on fixed rate debt |  |  |  | 5.875% | 5.875% |  | 5.875% |  |  |
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility, Due April 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Apr. 30, 2022 |  | Apr. 30, 2022 |  |  |
Targa Resources Partners LP [Member] | Revolving Credit Facility [Member] | TRP Senior Secured Revolving Credit Facility due June 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jun. 30, 2023 |  | Jun. 30, 2023 |  |  |
Maximum borrowing capacity |  |  |  | $ 2,200,000,000 | $ 2,200,000,000 |  |  |  |  |
Remaining borrowing capacity |  |  |  | $ 1,981,200,000 | $ 1,981,200,000 |  |  |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5⅞% Notes due April 2026 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Apr. 30, 2026 |  | Apr. 30, 2026 |  |  |
Interest rate on fixed rate debt |  |  |  | 5.875% | 5.875% |  | 5.875% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6½% Senior Notes due July 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jul. 31, 2027 |  | Jul. 31, 2027 |  |  |
Interest rate on fixed rate debt |  |  |  | 6.50% | 6.50% |  | 6.50% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5% Notes due January 2028 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jan. 31, 2028 |  | Jan. 31, 2028 |  |  |
Interest rate on fixed rate debt |  |  |  | 5.00% | 5.00% |  | 5.00% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4¼% Notes due November 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Nov. 30, 2023 |  | Nov. 30, 2023 |  |  |
Interest rate on fixed rate debt |  |  |  | 4.25% | 4.25% |  | 4.25% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5⅛% Notes due February 2025 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Feb. 28, 2025 |  | Feb. 28, 2025 |  |  |
Interest rate on fixed rate debt |  |  |  | 5.125% | 5.125% |  | 5.125% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jan. 31, 2029 |  | Jan. 31, 2029 |  |  |
Interest rate on fixed rate debt |  |  |  | 6.875% | 6.875% |  | 6.875% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5⅜% Notes due February 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Feb. 28, 2027 |  | Feb. 28, 2027 |  |  |
Interest rate on fixed rate debt |  |  |  | 5.375% | 5.375% |  | 5.375% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 5½% Senior Notes due March 2030 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Mar. 31, 2030 |  | Mar. 31, 2030 |  |  |
Interest rate on fixed rate debt |  |  |  | 5.50% | 5.50% |  | 5.50% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4⅞% Notes due February 2031 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Feb. 28, 2031 |  | Feb. 28, 2031 |  |  |
Interest rate on fixed rate debt |  |  |  | 4.875% | 4.875% |  | 4.875% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4¾% Notes due November 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Nov. 30, 2021 |  | Nov. 30, 2021 |  |  |
Interest rate on fixed rate debt |  |  |  | 4.75% | 4.75% |  | 4.75% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5⅞% Notes due August 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  |  |  |  |  | 5.875%
[1] | As of June 30, 2021, the Partnership had $360.0 million of qualifying receivables under its $400.0 million accounts receivable securitization facility (“Securitization Facility”), resulting in $40.0 million availability. During the second quarter of 2021, the Partnership amended the Securitization Facility to increase the facility size from $350.0 million to $400.0 million to more closely align with our expectation for borrowing needs given current commodity prices and to extend the facility termination date to April 21, 2022.
[2] | While we consolidate the debt of the Partnership in our financial statements, we do not have the obligation to make interest payments or debt payments with respect to the debt of the Partnership.

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