Derivative Assets And Liabilities Partnership's Derivative Assets And Liabilities, Amount Of Gain/(Loss) Reclassified From AOCI Into Income (Effective Portion) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Amount of Gain (Loss) on Derivatives	$ 15	$ (151)		$ (209)	$ (409)
Gains (losses) on interest rate derivatives	55	(175)	[1]	(277)	(371)	[1]
Commodity Derivatives - Trading [Member]
Amount of Gain (Loss) on Derivatives	4	3		15	15
Commodity derivatives
Amount of Gain (Loss) on Derivatives	$ (44)	$ 21		$ 53	$ (53)

[1] *As adjusted. See Note 1.