Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	[1]
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (907)	$ 1,219
Other comprehensive income (loss), net of tax:
Change in value of available-for-sale securities	(9)	5
Actuarial gain related to pension and other postretirement benefit plans	6	7
Change in other comprehensive income from unconsolidated affiliates	(16)	(4)
Total other comprehensive income (loss)	(19)	8
Comprehensive income (loss)	(926)	1,227
Less: Comprehensive income (loss) attributable to noncontrolling interests	(200)	256
Other Comprehensive Income, Portion Attributable to Redeemable Noncontrolling Interest	12	13
Comprehensive income (loss) attributable to partners	$ (738)	$ 958

[1] *As adjusted. See Note 1.