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Estimates (Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Commodity derivatives:	$ 560	$ 321
Other Assets, Fair Value Disclosure	26	21
Total assets	586	342
Interest rate derivatives	(163)	(219)
Commodity derivatives:	(583)	(341)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	746	560
Level 1 [Member]
Commodity derivatives:	448	277
Other Assets, Fair Value Disclosure	17	14
Total assets	465	291
Interest rate derivatives	0	0
Commodity derivatives:	(480)	(303)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	480	303
Level 2 [Member]
Commodity derivatives:	112	44
Other Assets, Fair Value Disclosure	9	7
Total assets	121	51
Interest rate derivatives	(163)	(219)
Commodity derivatives:	(103)	(38)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	266	257
Commodity Derivatives - Power [Member] | Options - Calls [Member]
Commodity derivatives:	1
Commodity Derivatives - Power [Member] | Forwards Swaps [Member]
Commodity derivatives:	48	23
Commodity derivatives:	(42)	(22)
Commodity Derivatives - Power [Member] | Future [Member]
Commodity derivatives:	1
Commodity derivatives:	(1)
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	0
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member]
Commodity derivatives:	1
Commodity derivatives:	(1)
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:	48	23
Commodity derivatives:	(42)	(22)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member]
Commodity derivatives:	0
Commodity derivatives:	0
Commodity Derivatives - Refined Products [Member] | Future [Member]
Commodity derivatives:	7	1
Commodity derivatives:	(15)	(28)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member]
Commodity derivatives:	7	1
Commodity derivatives:	(15)	(28)
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:	1	2
Commodity derivatives:		(6)
Commodity Derivatives - Crude [Member] | Future [Member]
Commodity derivatives:		2
Commodity derivatives:	(61)	(1)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	1	2
Commodity derivatives:		(6)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Future [Member]
Commodity derivatives:		2
Commodity derivatives:	(61)	(1)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	0
Commodity derivatives:		0
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Future [Member]
Commodity derivatives:		0
Commodity derivatives:	0	0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	42	11
Commodity derivatives:	(91)	(24)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	52	13
Commodity derivatives:	(40)	(15)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	97	70
Commodity derivatives:	(88)	(57)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]
Commodity derivatives:		(2)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	20	8
Commodity derivatives:	(21)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member]
Commodity derivatives:	42	11
Commodity derivatives:	(91)	(24)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member]
Commodity derivatives:	8	0
Commodity derivatives:	0	(1)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member]
Commodity derivatives:	97	70
Commodity derivatives:	(88)	(57)
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:	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:	44	13
Commodity derivatives:	(40)	(14)
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:		(2)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member]
Commodity derivatives:	20	8
Commodity derivatives:	(21)
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member]
Commodity derivatives:	291	191
Commodity derivatives:	(224)	(186)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member]
Commodity derivatives:	291	191
Commodity derivatives:	(224)	(186)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member]
Commodity derivatives:	0	0
Commodity derivatives:	$ 0	$ 0

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