Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	[1]	Sep. 30, 2020	Sep. 30, 2019	[1]
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (362)	$ 1,250		$ (557)	$ 3,751
Other comprehensive income (loss), net of tax:
Change in value of available-for-sale securities	3	0		3	8
Actuarial gain (loss) related to pension and other postretirement benefit plans	4	(3)		18	7
Foreign currency translation adjustments	18	0		48	0
Change in other comprehensive income from unconsolidated affiliates	1	(4)		(15)	(13)
Total other comprehensive income (loss)	26	(7)		54	2
Comprehensive income (loss)	(336)	1,243		(503)	3,753
Less: Comprehensive income attributable to noncontrolling interests	284	261		309	783
Other Comprehensive Income, Portion Attributable to Redeemable Noncontrolling Interest	11	12		36	38
Comprehensive Income Attributable to Predecessor Equity	0	0		(6)	0
Comprehensive income (loss) attributable to partners	$ (631)	$ 970		$ (842)	$ 2,932

[1] *As adjusted. See Note 1.