Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (549)	$ 76
Other comprehensive income:
Other comprehensive income	0	0
Other comprehensive income	0	0
Total comprehensive income	(549)	76
Total comprehensive income attributable to noncontrolling interests	(1)	(1)
Total comprehensive income attributable to partners	$ (550)	$ 75