CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Total revenues		$ 16,060.3	$ 20,929.8	$ 16,949.8
Costs and expenses:
Product purchases and fuel		10,676.4	16,882.1	13,729.5
Operating expenses		1,077.9	912.8	747.0
Depreciation and amortization expense		1,329.6	1,096.0	870.6
General and administrative expense		348.7	309.7	273.2
Impairment of long-lived assets				452.3
Other operating (income) expense		1.5	0.2	12.4
Income (loss) from operations		2,626.2	1,729.0	864.8
Other income (expense):
Interest expense, net		(687.8)	(446.1)	(387.9)
Equity earnings (loss)		9.0	9.1	(23.9)
Gain (loss) from financing activities		(2.1)	(49.6)	(16.6)
Gain (loss) from sale of equity-method investment			435.9
Other, net		(2.8)	(15.1)	0.5
Income (loss) before income taxes		1,942.5	1,663.2	436.9
Income tax (expense) benefit		(363.2)	(131.8)	(14.8)
Net income (loss)		1,579.3	1,531.4	422.1
Less: Net income (loss) attributable to noncontrolling interests		233.4	335.9	350.9
Net income (loss) attributable to Targa Resources Corp.		1,345.9	1,195.5	71.2
Premium on repurchase of noncontrolling interests, net of tax	[1]	510.1	53.2
Dividends on Series A Preferred Stock			30.0	87.3
Deemed dividends on Series A Preferred Stock			215.5
Net income (loss) attributable to common shareholders		$ 835.8	$ 896.8	$ (16.1)
Net income (loss) per common share - basic		$ 3.69	$ 3.95	$ (0.07)
Net income (loss) per common share - diluted		$ 3.66	$ 3.88	$ (0.07)
Weighted average shares outstanding - basic		224.6	227.3	228.6
Weighted average shares outstanding - diluted		226.0	231.1	228.6
Sales of Commodities [Member]
Revenues:
Total revenues		$ 13,962.1	$ 19,066.0	$ 15,602.5
Fees from Midstream Services [Member]
Revenues:
Total revenues		$ 2,098.2	$ 1,863.8	$ 1,347.3

[1] Represents premium paid on the Grand Prix Transaction, Carnero Acquisition and the DevCo JV Repurchase. See Note 4 – Acquisitions and Divestitures