Condensed Consolidated Statement of Comprehensive Income Statement (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (163)	$ 133	$ (14)	$ 380
Other comprehensive income (loss):
Change in fair value of interest rate derivative instruments	0	(1)	(7)	(4)
Reclassification of interest rate derivative losses to net income	2	0	3	0
Other comprehensive income (loss)	2	(1)	(4)	(4)
Comprehensive income (loss)	(161)	132	(18)	376
Less: Comprehensive income (loss) attributable to noncontrolling interest	1	1	(6)	2
Comprehensive income (loss) attributable to Limited Partners	$ (162)	$ 131	$ (12)	$ 374