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Debt Obligations - Senior Unsecured Notes Issuances - Additional Information (Details) - Senior Unsecured Notes [Member] - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 | Aug. 31, 2020 | Nov. 30, 2019 | Jan. 31, 2019 | Apr. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 01, 2020
Senior Unsecured 5⅞% Notes due April 2026 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  |  | $ 1,000.0 |  |  |
Interest rate on fixed rate debt |  |  |  |  | 5.875% |  |  |
Maturity date |  |  |  |  | Apr. 30, 2026 |  |  |
Net proceeds from private placement of notes |  |  |  |  | $ 991.9 |  |  |
Senior Unsecured 5⅞% Notes due April 2026 [Member] | Targa Resources Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 5.875% | 5.875% |
Maturity date |  |  |  |  |  | Apr. 30, 2026 | Apr. 30, 2026 |
Senior Unsecured 6½% Senior Notes due July 2027 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  | $ 750.0 |  |  |  |
Interest rate on fixed rate debt |  |  |  | 6.50% |  |  |  |
Maturity date |  |  |  | Jul. 31, 2027 |  |  |  |
Net proceeds from private placement of notes |  |  |  | $ 1,486.6 |  |  |  |
Senior Unsecured 6½% Senior Notes due July 2027 [Member] | Targa Resources Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 6.50% | 6.50% |
Maturity date |  |  |  |  |  | Jul. 31, 2027 | Jul. 31, 2027 |
Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  | $ 750.0 |  |  |  |
Interest rate on fixed rate debt |  |  |  | 6.875% |  |  |  |
Maturity date |  |  |  | Jan. 31, 2029 |  |  |  |
Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member] | Targa Resources Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 6.875% | 6.875% |
Maturity date |  |  |  |  |  | Jan. 31, 2029 | Jan. 31, 2029 |
Senior Unsecured 4 1/8% notes due November 2019 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  | 4.125% |  |  |  |
Senior Unsecured of 5½% Senior Notes due March 2030 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued |  |  | $ 1,000.0 |  |  |  |  |
Interest rate on fixed rate debt |  |  | 5.50% |  |  |  |  |
Maturity date |  |  | Mar. 31, 2030 |  |  |  |  |
Net proceeds from private placement of notes |  |  | $ 990.8 |  |  |  |  |
Senior Unsecured of 5½% Senior Notes due March 2030 [Member] | Targa Resources Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 5.50% | 5.50% |
Maturity date |  |  |  |  |  | Mar. 31, 2030 | Mar. 31, 2030 |
Senior Unsecured 4⅞% Notes due February 2031 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued |  | $ 1,000.0 |  |  |  |  |  |
Interest rate on fixed rate debt |  | 4.875% |  |  |  |  |  |
Net proceeds from private placement of notes |  | $ 991.0 |  |  |  |  |  |
Senior Unsecured 4⅞% Notes due February 2031 [Member] | Targa Resources Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 4.875% | 4.875% |
Maturity date |  |  |  |  |  | Feb. 28, 2031 | Feb. 28, 2031 |
Senior Unsecured 6¾% Notes due March 2024 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  | 6.75% |  |  |  |  |  | 6.75%
Senior Unsecured 6¾% Notes due March 2024 [Member] | Targa Resources Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 6.75% | 6.75% |
Maturity date |  |  |  |  |  | Mar. 31, 2024 | Mar. 31, 2024 |
Senior Unsecured of 4% Senior Notes due 2032 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued | $ 1,000.0 |  |  |  |  |  |  |
Interest rate on fixed rate debt | 4.00% |  |  |  |  |  |  |
Net proceeds from private placement of notes | $ 992.0 |  |  |  |  |  |  |
Senior Unsecured 5⅛% Notes due 2025 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt | 5.125% |  |  |  |  |  |  |
Senior Unsecured 4 3/4% Notes due November 2021 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 4.75% | 4.75% |
Maturity date |  |  |  |  |  | Nov. 30, 2021 | Nov. 30, 2021 |
Senior Unsecured 4 3/4% Notes due November 2021 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt | 4.75% |  |  |  |  |  |  |
Senior Unsecured 5 7/8% Notes due August 2023 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  | 5.875% | 5.875% |
Maturity date |  |  |  |  |  | Aug. 31, 2023 | Aug. 31, 2023 |
Senior Unsecured 5 7/8% Notes due August 2023 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on fixed rate debt | 5.875% |  |  |  |  |  |  |

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