CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Total revenues		$ 20,929.8	$ 16,949.8	$ 8,260.3
Costs and expenses:
Product purchases and fuel		16,882.1	13,729.5	5,186.5
Operating expenses		912.8	747.0	698.4
Depreciation and amortization expense		1,096.0	870.6	865.1
General and administrative expense		309.7	273.2	254.6
Impairment of long-lived assets			452.3	2,442.8
Other operating (income) expense		0.2	12.4	116.6
Income (loss) from operations		1,729.0	864.8	(1,303.7)
Other income (expense):
Interest expense, net		(446.1)	(387.9)	(391.3)
Equity earnings (loss)		9.1	(23.9)	72.6
Gain (loss) from financing activities		(49.6)	(16.6)	45.6
Gain (loss) from sale of equity-method investment		435.9
Other, net		(15.1)	0.5	3.7
Income (loss) before income taxes		1,663.2	436.9	(1,573.1)
Income tax (expense) benefit		(131.8)	(14.8)	248.1
Net income (loss)		1,531.4	422.1	(1,325.0)
Less: Net income (loss) attributable to noncontrolling interests		335.9	350.9	228.9
Net income (loss) attributable to Targa Resources Corp.		1,195.5	71.2	(1,553.9)
Premium on repurchase of noncontrolling interests, net of tax	[1]	53.2
Dividends on Series A Preferred Stock		30.0	87.3	91.7
Deemed dividends on Series A Preferred Stock		215.5		39.2
Net income (loss) attributable to common shareholders		$ 896.8	$ (16.1)	$ (1,684.8)
Net income (loss) per common share - basic		$ 3.95	$ (0.07)	$ (7.26)
Net income (loss) per common share - diluted		$ 3.88	$ (0.07)	$ (7.26)
Weighted average shares outstanding - basic		227.3	228.6	232.2
Weighted average shares outstanding - diluted		231.1	228.6	232.2
Sales of Commodities [Member]
Revenues:
Total revenues		$ 19,066.0	$ 15,602.5	$ 7,171.0
Fees from Midstream Services [Member]
Revenues:
Total revenues		$ 1,863.8	$ 1,347.3	$ 1,089.3

[1] Represents premium paid on the DevCo JV Repurchase. See Note 4 – Acquisitions and Divestitures.