Condensed Consolidated Statement of Comprehensive Income Statement (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 44	$ 124	$ 149	$ 247
Other comprehensive loss:
Unrealized losses on derivative instruments	0	(3)	(6)	(3)
Other comprehensive loss	0	(3)	(6)	(3)
Comprehensive income	44	121	143	244
Less: Comprehensive (loss) income attributable to noncontrolling interest	0	0	(7)	1
Comprehensive income attributable to Limited Partners	$ 44	$ 121	$ 150	$ 243