CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income (loss)	$ 1,531.4	$ 422.1	$ (1,325.0)
Commodity hedging contracts:
Other comprehensive income (loss), pre-tax	367.4	(117.3)	(309.1)
Other comprehensive income (loss), related income tax	(81.8)	28.2	74.8
Other comprehensive income (loss), after tax	285.6	(89.1)	(234.3)
Comprehensive income (loss)	1,817.0	333.0	(1,559.3)
Less: Comprehensive income (loss) attributable to noncontrolling interests	335.9	350.9	228.9
Comprehensive income (loss) attributable to Targa Resources Corp.	1,481.1	(17.9)	(1,788.2)
Commodity Contracts [Member]
Commodity hedging contracts:
Change in fair value, pre-tax	(5.6)	(534.6)	(218.3)
Change in fair value, related income tax	1.3	128.4	51.5
Change in fair value, after tax	(4.3)	(406.2)	(166.8)
Settlements reclassified to revenues, pre-tax	373.0	417.3	(90.8)
Settlements reclassified to revenues, related income tax	(83.1)	(100.2)	23.3
Settlements reclassified to revenues, after tax	$ 289.9	$ 317.1	$ (67.5)