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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Liabilities, Fair Value Disclosure, Recurring		$ (560)
Level 1
Liabilities, Fair Value Disclosure, Recurring		(303)
Level 2
Liabilities, Fair Value Disclosure, Recurring		(257)
Fair Value, Measurements, Recurring [Member]
Price Risk Derivative Assets, at Fair Value	$ 255	321
Other Assets, Fair Value Disclosure	21	21
Assets, Fair Value Disclosure	276	342
Interest Rate Derivative Liabilities, at Fair Value	(167)	(219)
Price Risk Derivative Liabilities, at Fair Value	(350)	(341)
Liabilities, Fair Value Disclosure, Recurring	(517)
Fair Value, Measurements, Recurring [Member] | Level 1
Price Risk Derivative Assets, at Fair Value	169	277
Other Assets, Fair Value Disclosure	14	14
Assets, Fair Value Disclosure	183	291
Interest Rate Derivative Liabilities, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	(271)	(303)
Liabilities, Fair Value Disclosure, Recurring	(271)
Fair Value, Measurements, Recurring [Member] | Level 2
Price Risk Derivative Assets, at Fair Value	86	44
Other Assets, Fair Value Disclosure	7	7
Assets, Fair Value Disclosure	93	51
Interest Rate Derivative Liabilities, at Fair Value	(167)	(219)
Price Risk Derivative Liabilities, at Fair Value	(79)	(38)
Liabilities, Fair Value Disclosure, Recurring	(246)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	35	11
Price Risk Derivative Liabilities, at Fair Value		(24)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	1	13
Price Risk Derivative Liabilities, at Fair Value		(15)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	14	70
Price Risk Derivative Liabilities, at Fair Value		(57)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	7	8
Price Risk Derivative Liabilities, at Fair Value		2
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	35	11
Price Risk Derivative Liabilities, at Fair Value		(24)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value		(1)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	14	70
Price Risk Derivative Liabilities, at Fair Value		(57)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value		0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value		0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	1	13
Price Risk Derivative Liabilities, at Fair Value		(14)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value		0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	7	8
Price Risk Derivative Liabilities, at Fair Value		2
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Liabilities, at Fair Value	(81)
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Swing Swaps IFERC [Member]
Price Risk Derivative Liabilities, at Fair Value	(1)
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Liabilities, at Fair Value	(13)
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Forward Physical Swaps [Member]
Price Risk Derivative Liabilities, at Fair Value	(6)
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]
Price Risk Derivative Liabilities, at Fair Value	(81)
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Forward Physical Swaps [Member]
Price Risk Derivative Liabilities, at Fair Value	13
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Liabilities, at Fair Value	6
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Fixed Swaps/Futures [Member]
Price Risk Derivative Liabilities, at Fair Value	(1)
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Refined Products [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	3	1
Price Risk Derivative Liabilities, at Fair Value	(6)	(28)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	3	1
Price Risk Derivative Liabilities, at Fair Value	(6)	(28)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Refined Products [Member] | Level 2 | Future [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Crude [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value		2
Price Risk Derivative Liabilities, at Fair Value		(1)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value		2
Price Risk Derivative Liabilities, at Fair Value		(1)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Crude [Member] | Level 2 | Future [Member]
Price Risk Derivative Assets, at Fair Value		0
Price Risk Derivative Liabilities, at Fair Value		0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	78	23
Price Risk Derivative Liabilities, at Fair Value	(72)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Call Option [Member]
Price Risk Derivative Assets, at Fair Value	1
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Options - Puts [Member]
Price Risk Derivative Assets, at Fair Value	1
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Future [Member]
Price Risk Derivative Liabilities, at Fair Value		(22)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value		0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member]
Price Risk Derivative Assets, at Fair Value	1
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Options - Puts [Member]
Price Risk Derivative Assets, at Fair Value	1
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	78	23
Price Risk Derivative Liabilities, at Fair Value		(22)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Fixed Swaps/Futures [Member]
Price Risk Derivative Liabilities, at Fair Value	(72)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]
Price Risk Derivative Assets, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Options - Puts [Member]
Price Risk Derivative Assets, at Fair Value	0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - NGLs [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	115	193
Price Risk Derivative Liabilities, at Fair Value	(169)	(192)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	115	193
Price Risk Derivative Liabilities, at Fair Value	169	(192)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - NGLs [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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