CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 504	$ 301	$ 1,279	$ 953
Other comprehensive income/(loss)	(51)	36	142	(68)
Comprehensive income	453	337	1,421	885
Comprehensive income attributable to noncontrolling interests	(384)	(294)	(1,183)	(790)
Comprehensive income attributable to PAGP	$ 69	$ 43	$ 238	$ 95