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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, 2021	Dec. 31, 2020
Commodity derivatives:	$ 272	$ 168
Other Assets, Fair Value Disclosure	39	34
Total assets	311	202
Interest rate derivatives	(387)	(448)
Commodity derivatives:	(211)	(269)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(598)	(717)
Level 1 [Member]
Commodity derivatives:	248	158
Other Assets, Fair Value Disclosure	26	22
Total assets	274	180
Interest rate derivatives	0	0
Commodity derivatives:	(190)	(265)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(190)	(265)
Level 2 [Member]
Commodity derivatives:	24	10
Other Assets, Fair Value Disclosure	13	12
Total assets	37	22
Interest rate derivatives	(387)	(448)
Commodity derivatives:	(21)	(4)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(408)	(452)
Commodity Derivatives - Power [Member] | Options - Calls [Member]
Commodity derivatives:		1
Commodity Derivatives - Power [Member] | Forwards Swaps [Member]
Commodity derivatives:	17	4
Commodity derivatives:	(15)
Commodity Derivatives - Power [Member] | Future [Member]
Commodity derivatives:	6	2
Commodity derivatives:	(4)	(3)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Calls [Member]
Commodity derivatives:		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:	6	2
Commodity derivatives:	(4)	(3)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Calls [Member]
Commodity derivatives:		0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	17	4
Commodity derivatives:	(15)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member]
Commodity derivatives:	0	0
Commodity derivatives:	0	0
Commodity Derivatives - Refined Products [Member] | Future [Member]
Commodity derivatives:	3	3
Commodity derivatives:	(18)	(11)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member]
Commodity derivatives:	3	3
Commodity derivatives:	(18)	(11)
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:	16
Commodity derivatives:	(3)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	16
Commodity derivatives:	(3)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0
Commodity derivatives:	0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	7	12
Commodity derivatives:	(10)	(11)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	38	1
Commodity derivatives:	(6)	(3)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	26	13
Commodity derivatives:	(9)	(13)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]
Commodity derivatives:	(6)	(1)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	7	5
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	7	12
Commodity derivatives:	(10)	(11)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	38	0
Commodity derivatives:	(6)	0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	26	13
Commodity derivatives:	(9)	(13)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Contracts [Member]
Commodity derivatives:	0	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:	0	1
Commodity derivatives:	0	(3)
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:	(6)	(1)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	7	5
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member]
Commodity derivatives:	152	127
Commodity derivatives:	(140)	(227)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	152	127
Commodity derivatives:	(140)	(227)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	0
Commodity derivatives:	$ 0	$ 0

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