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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 21, 2024 | Aug. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from borrowings under accounts receivable securitization facility |  |  | $ 775,000,000 | $ 103,100,000 |
Loan repayment | $ 1,500,000,000 |  |  |  |
Gain (loss) due to debt extinguishments | $ (800,000) |  |  |  |
Senior Unsecured 6.150% Fixed Rate, due March 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on fixed rate debt |  |  | 6.15% |  | 6.15%
Accounts Receivable Securitization Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  | Aug. 29, 2025 |  |  |
Proceeds from borrowings under accounts receivable securitization facility |  |  | $ 600,000,000 |  |
Remaining liquidity needs |  | $ 600,000,000 | $ 0 |  |
Revolving Credit Facility [Member] | TRGP Senior Revolving Credit Facility due February 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Feb. 28, 2027 |  | Feb. 28, 2027
Borrowings outstanding |  |  | $ 0 |  |
Revolving Credit Facility [Member] | Commercial Paper Program [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings outstanding |  |  | 951,000,000 |  |
Revolving Credit Facility [Member] | Letter of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Remaining liquidity needs |  |  | $ 1,800,000,000 |  |
Term Loan Facility, Variable Rate, due July 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Jul. 31, 2025 |  | Jul. 31, 2025
Senior Unsecured Notes [Member] | Senior Unsecured 5.200% Fixed Rate, due July 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Jul. 31, 2027 |  | Jul. 31, 2027
Interest rate on fixed rate debt |  |  | 5.20% |  | 5.20%
Senior Unsecured Notes [Member] | Senior Unsecured 6.150% Fixed Rate, due March 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Mar. 31, 2029 |  | Mar. 31, 2029
Senior Unsecured Notes [Member] | Senior Unsecured 4.200% Notes due February 2033 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Feb. 28, 2033 |  | Feb. 28, 2023
Interest rate on fixed rate debt |  |  | 4.20% |  | 4.20%
Senior Unsecured Notes [Member] | Senior Unsecured 6.125% Fixed Rate, due March 2033 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Mar. 31, 2033 |  | Mar. 31, 2033
Interest rate on fixed rate debt |  |  | 6.125% |  | 6.125%
Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, due March 2034 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Mar. 31, 2034 |  | Mar. 31, 2034
Interest rate on fixed rate debt |  |  | 6.50% |  | 6.50%
Senior Unsecured Notes [Member] | Senior Unsecured 5.500% Fixed Rate, due February 2035 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Feb. 28, 2035 |  | Feb. 28, 2035
Interest rate on fixed rate debt |  | 5.50% | 5.50% |  | 5.50%
Senior Unsecured Notes [Member] | Senior Unsecured 4.950% Notes due April 2052 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Apr. 30, 2052 |  | Apr. 30, 2052
Interest rate on fixed rate debt |  |  | 4.95% |  | 4.95%
Senior Unsecured Notes [Member] | Senior Unsecured 6.250% fixed rate, due July 2052 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Jul. 31, 2052 |  | Jul. 31, 2052
Interest rate on fixed rate debt |  |  | 6.25% |  | 6.25%
Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, due February 2053 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Feb. 28, 2053 |  | Feb. 28, 2053
Interest rate on fixed rate debt |  |  | 6.50% |  | 6.50%
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility, due August 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  | Aug. 31, 2025 |  | Aug. 31, 2025
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, 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%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5.000% 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%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 6.875% 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%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 5.500% 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%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 4.875% Senior 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%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 4.000% 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%

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