CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income (loss)	$ 1,579.3	$ 1,531.4	$ 422.1
Commodity hedging contracts:
Other comprehensive income (loss), pre-tax	40.0	367.4	(117.3)
Other comprehensive income (loss), related income tax	(9.1)	(81.8)	28.2
Other comprehensive income (loss), after tax	30.9	285.6	(89.1)
Comprehensive income (loss)	1,610.2	1,817.0	333.0
Less: Comprehensive income (loss) attributable to noncontrolling interests	233.4	335.9	350.9
Comprehensive income (loss) attributable to Targa Resources Corp.	1,376.8	1,481.1	(17.9)
Commodity Contracts [Member]
Commodity hedging contracts:
Change in fair value, pre-tax	193.4	(5.6)	(534.6)
Change in fair value, related income tax	(44.3)	1.3	128.4
Change in fair value, after tax	149.1	(4.3)	(406.2)
Settlements reclassified to revenues, pre-tax	(153.4)	373.0	417.3
Settlements reclassified to revenues, related income tax	35.2	(83.1)	(100.2)
Settlements reclassified to revenues, after tax	$ (118.2)	$ 289.9	$ 317.1