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Debt Obligations - Summary Of Debt Obligations (Details) - USD ($)
$ in Millions

Sep. 30, 2024

Dec. 31, 2023

Current:

Partnership accounts receivable securitization facility, due August 2025

^[1]

$ 600.0

$ 575.0

Finance lease liabilities

53.3

45.7

Current debt obligations

653.3

620.7

Long-term [Abstract]

Long-term debt including Unamortized premium(discount) and Debt issuance costs

13,455.7

12,179.9

Debt issuance costs, net of amortization

(91.6)

(90.8)

Finance lease liabilities

237.3

244.1

Long-term debt

13,601.4

12,333.2

Total debt obligations

14,254.7

12,953.9

Senior Unsecured Notes [Member]

Long-term [Abstract]

Unamortized discount

(29.7)

(29.5)

Senior Unsecured Notes [Member] | Senior Unsecured 5.200% Fixed Rate, due July 2027 [Member]

Long-term [Abstract]

Long-term debt

750.0

750.0

Senior Unsecured Notes [Member] | Senior Unsecured 6.150% Fixed Rate, due March 2029 [Member]

Long-term [Abstract]

Long-term debt

1,000.0

1,000.0

Senior Unsecured Notes [Member] | Senior Unsecured 4.200% Notes due February 2033 [Member]

Long-term [Abstract]

Long-term debt

750.0

750.0

Senior Unsecured Notes [Member] | Senior Unsecured 6.125% Fixed Rate, due March 2033 [Member]

Long-term [Abstract]

Long-term debt

900.0

900.0

Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, due March 2034 [Member]

Long-term [Abstract]

Long-term debt

1,000.0

1,000.0

Senior Unsecured Notes [Member] | Senior Unsecured 5.500% Fixed Rate, due February 2035 [Member]

Long-term [Abstract]

Long-term debt

1,000.0

0.0

Senior Unsecured Notes [Member] | Senior Unsecured 4.950% Notes due April 2052 [Member]

Long-term [Abstract]

Long-term debt

750.0

750.0

Senior Unsecured Notes [Member] | Senior Unsecured 6.250% fixed rate, due July 2052 [Member]

Long-term [Abstract]

Long-term debt

500.0

500.0

Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, due February 2053 [Member]

Long-term [Abstract]

Long-term debt

850.0

850.0

Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, due July 2027 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Long-term debt

^[2]

705.2

705.2

Senior Unsecured Notes [Member] | Senior Unsecured 5.000% Notes due January 2028 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Long-term debt

^[2]

700.3

700.3

Senior Unsecured Notes [Member] | Senior Unsecured of 6.875% Senior Notes due January 2029 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Long-term debt

^[2]

679.3

679.3

Senior Unsecured Notes [Member] | Senior Unsecured of 5.500% Senior Notes due March 2030 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Long-term debt

^[2]

949.6

949.6

Senior Unsecured Notes [Member] | Senior Unsecured of 4.875% Senior Notes due February 2031 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Long-term debt

^[2]

1,000.0

1,000.0

Senior Unsecured Notes [Member] | Senior Unsecured of 4.000% Senior Notes due January 2032 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Long-term debt

^[2]

1,000.0

1,000.0

Revolving Credit Facility [Member] | TRGP Senior Revolving Credit Facility due February 2027 [Member]

Long-term [Abstract]

Long-term debt

^[3]

951.0

175.0

Revolving Credit Facility [Member] | TRGP Senior Revolving Credit Facility due February 2027 [Member] | Targa Resources Partners LP [Member]

Long-term [Abstract]

Letters of credit outstanding

^[3]

$ 15.5

22.3

Term Loan Facility, Variable Rate, due July 2025

Long-term [Abstract]

Long-term debt

^[4]

$ 500.0

[1]	In August 2024, the Partnership amended its $600.0 million accounts receivable securitization facility (the “Securitization Facility”) to extend the termination date of the Securitization Facility to August 29, 2025. As of September 30, 2024, the Partnership had $600.0 million of qualifying receivables under the Securitization Facility, resulting in no availability.
[2]	We guarantee all of the Partnership’s outstanding senior unsecured notes.
[3]	We maintain an unsecured commercial paper note program (the “Commercial Paper Program”), the borrowings of which are supported through maintaining a minimum available borrowing capacity under our $2.75 billion TRGP senior revolving credit facility (the “TRGP Revolver”) equal to the aggregate amount outstanding under the Commercial Paper Program. As of September 30, 2024, the TRGP Revolver had no borrowings outstanding and the Commercial Paper Program had $951.0 million borrowings outstanding, resulting in approximately $1.8 billion of available liquidity, after accounting for outstanding letters of credit.
[4]	On May 21, 2024, we repaid the remaining balance and subsequently terminated the $1.5 billion unsecured term loan facility due July 2025 (“Term Loan Facility”). As a result of the repayment, we recorded a loss due to debt extinguishment of $0.8 million.

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