UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 160	$ 167
Other comprehensive income (loss), net of tax:
Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax	0	0
Comprehensive income	160	167
Less comprehensive income attributable to:
Noncontrolling interests	2	4
Comprehensive income attributable to the Partnership	$ 158	$ 163