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Debt Obligations - Summary Of Debt Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Current Obligations of the Partnership [Abstract]    
Partnership accounts receivable securitization facility, due August 2024 [1] $ 575.0 $ 800.0
Finance lease liabilities [2] 45.7 34.3
Current debt obligations 620.7 834.3
Long-term [Abstract]    
Long-term debt including Unamortized premium(discount) and Debt issuance costs 12,179.9 10,574.7
Debt issuance costs, net of amortization (90.8) (65.6)
Finance lease liabilities [2] 244.1 193.0
Long-term debt 12,333.2 10,702.1
Total debt obligations 12,953.9 11,536.4
Senior Unsecured Notes [Member]    
Long-term [Abstract]    
Unamortized discount (29.5) (8.4)
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 0.0
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 0.0
Senior Unsecured Notes [Member] | Senior Unsecured 6.500% Fixed Rate, due March 2034 [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 0.0
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 [3] 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 [3] 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 [3] 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 [3] 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 [3] 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 [3] 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 [4] 175.0 1,298.7
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 [4] 22.3 33.2
Term Loan Facility, Variable Rate, due July 2025    
Long-term [Abstract]    
Long-term debt $ 500.0 $ 1,500.0
[1] As of December 31, 2023, the Partnership had $575.0 million of qualifying receivables under its $600.0 million accounts receivable securitization facility (the “Securitization Facility”), resulting in $25.0 million of availability.
[2] The December 31, 2022 balance includes $171.2 million of assets and $167.0 million of liabilities related to compressor leases from the Delaware Basin Acquisition that were subsequently amended and extended.
[3] As of February 2022, we guarantee all of the Partnership’s outstanding senior unsecured notes.
[4] 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 the TRGP Revolver equal to the aggregate amount outstanding under the Commercial Paper Program. As of December 31, 2023, the TRGP Revolver had no borrowings outstanding and the Commercial Paper Program had $175.0 million borrowings outstanding, resulting