Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	[1]	Jun. 30, 2020	Jun. 30, 2019	[1]
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 719	$ 1,282		$ (195)	$ 2,501
Other comprehensive income (loss), net of tax:
Change in value of available-for-sale securities	9	3		0	8
Actuarial gain related to pension and other postretirement benefit plans	8	3		14	10
Foreign currency translation adjustments	30	0		30	0
Change in other comprehensive income from unconsolidated affiliates	0	(5)		(16)	(9)
Total other comprehensive income (loss)	47	1		28	9
Comprehensive income (loss)	766	1,283		(167)	2,510
Less: Comprehensive income attributable to noncontrolling interests	225	266		25	522
Other Comprehensive Income, Portion Attributable to Redeemable Noncontrolling Interest	13	13		25	26
Comprehensive Income Attributable to Predecessor Equity	0	0		(6)	0
Comprehensive income (loss) attributable to partners	$ 528	$ 1,004		$ (211)	$ 1,962

[1] *As adjusted. See Note 1.