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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from borrowings under accounts receivable securitization facility |  |  | $ 226,400,000 | $ 742,900,000 |  |
Accounts receivable securitization facility | [1],[2] | $ 250,000,000.0 | 250,000,000.0 |  |  | $ 370,000,000.0
Accounts Receivable Securitization Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Apr. 21, 2021 |  |  |  |
Proceeds from borrowings under accounts receivable securitization facility |  |  | 250,000,000.0 |  |  |
Accounts receivable securitization facility |  | $ 250,000,000.0 | 250,000,000.0 |  |  |
Remaining borrowing capacity |  | 0 | 0 |  |  |
Maximum borrowing capacity |  | 250,000,000.0 | $ 250,000,000.0 |  | $ 400,000,000.0 |
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due June 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Jun. 30, 2023 |  |  |
Remaining borrowing capacity |  | 235,000,000.0 | $ 235,000,000.0 |  |  |
Maximum borrowing capacity |  | $ 670,000,000.0 | $ 670,000,000.0 |  |  |
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4 3/4% Notes due November 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Nov. 30, 2021 |  |  |
Interest rate on fixed rate debt |  | 4.75% | 4.75% |  |  |
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5 7/8% Notes due August 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Aug. 31, 2023 |  |  |
Interest rate on fixed rate debt |  | 5.875% | 5.875% |  |  |
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility Due December 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Apr. 30, 2021 |  |  |
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 |  |  |
Remaining borrowing capacity |  | $ 1,703,200,000 | $ 1,703,200,000 |  |  |
Maximum borrowing capacity |  | $ 2,200,000,000 | $ 2,200,000,000 |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 7/8% Notes due April 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Apr. 30, 2026 |  |  |
Interest rate on fixed rate debt |  | 5.875% | 5.875% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 1/4% Notes due May 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | May 31, 2023 |  |  |
Interest rate on fixed rate debt |  | 5.25% | 5.25% |  |  |
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 |  |  |
Interest rate on fixed rate debt |  | 5.00% | 5.00% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4 1/4% Notes due November 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Nov. 30, 2023 |  |  |
Interest rate on fixed rate debt |  | 4.25% | 4.25% |  |  |
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 |  |  |
Interest rate on fixed rate debt |  | 6.50% | 6.50% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6 3/4% Notes due March 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Mar. 31, 2024 |  |  |
Interest rate on fixed rate debt |  | 6.75% | 6.75% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 1/8% Notes due February 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Feb. 28, 2025 |  |  |
Interest rate on fixed rate debt |  | 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 |  |  |
Interest rate on fixed rate debt |  | 6.875% | 6.875% |  |  |
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 3/8% Notes due February 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  |  | Feb. 28, 2027 |  |  |
Interest rate on fixed rate debt |  | 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 |  |  |
Interest rate on fixed rate debt |  | 5.50% | 5.50% |  |  |
[1] | As of June 30, 2020, the Partnership had $250.0 million of qualifying receivables under its $250.0 million accounts receivable securitization facility (“Securitization Facility”), resulting in zero availability. During the second quarter of 2020, the Partnership amended the Securitization Facility to decrease the facility size from $400.0 million to $250.0 million to more closely align with our expectations for borrowing needs given commodity prices and to extend the facility termination date to April 21, 2021.
[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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