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Estimates (Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Commodity derivatives:	$ 168	$ 384
Other Assets, Fair Value Disclosure	34	31
Total assets	202	415
Interest rate derivatives	(448)	(399)
Commodity derivatives:	(269)	(389)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	717	788
Level 1 [Member]
Commodity derivatives:	158	369
Other Assets, Fair Value Disclosure	22	20
Total assets	180	389
Interest rate derivatives	0	0
Commodity derivatives:	(265)	(383)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	265	383
Level 2 [Member]
Commodity derivatives:	10	15
Other Assets, Fair Value Disclosure	12	11
Total assets	22	26
Interest rate derivatives	(448)	(399)
Commodity derivatives:	(4)	(6)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	452	405
Commodity Derivatives - Power [Member] | Options - Calls [Member]
Commodity derivatives:	1	1
Commodity Derivatives - Power [Member] | Forwards Swaps [Member]
Commodity derivatives:	4	11
Commodity derivatives:		(5)
Commodity Derivatives - Power [Member] | Future [Member]
Commodity derivatives:	2	4
Commodity derivatives:	(3)	(3)
Commodity Derivatives - Power [Member] | Put Option [Member]
Commodity derivatives:		1
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Calls [Member]
Commodity derivatives:	1	1
Commodity Derivatives - Power [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	0
Commodity derivatives:		0
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member]
Commodity derivatives:	2	4
Commodity derivatives:	(3)	(3)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Put Option [Member]
Commodity derivatives:		1
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Calls [Member]
Commodity derivatives:	0	0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	4	11
Commodity derivatives:		(5)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member]
Commodity derivatives:	0	0
Commodity derivatives:	0	0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Put Option [Member]
Commodity derivatives:		0
Commodity Derivatives - Refined Products [Member] | Future [Member]
Commodity derivatives:	3	8
Commodity derivatives:	(11)	(10)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member]
Commodity derivatives:	3	8
Commodity derivatives:	(11)	(10)
Commodity Derivatives - Refined Products [Member] | Level 2 [Member] | Future [Member]
Commodity derivatives:	0	0
Commodity derivatives:	0	0
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	13
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	13
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	12	17
Commodity derivatives:	(11)	(49)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	1	1
Commodity derivatives:	(3)	(1)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	13	65
Commodity derivatives:	(13)	(43)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]
Commodity derivatives:	(1)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	5	3
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	12	17
Commodity derivatives:	(11)	(49)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	0	0
Commodity derivatives:	0	0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	13	65
Commodity derivatives:	(13)	(43)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Contracts [Member]
Commodity derivatives:	0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	0	0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	0	0
Commodity derivatives:	0	0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	1	1
Commodity derivatives:	(3)	(1)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	0	0
Commodity derivatives:	0	0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Contracts [Member]
Commodity derivatives:	(1)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	5	3
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member]
Commodity derivatives:	127	260
Commodity derivatives:	(227)	(278)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	127	260
Commodity derivatives:	(227)	(278)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	0
Commodity derivatives:	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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