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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Price Risk Derivative Assets, at Fair Value	$ 338	$ 560
Other Assets, Fair Value Disclosure	28	26
Assets, Fair Value Disclosure	366	586
Interest Rate Derivative Liabilities, at Fair Value	(232)	(163)
Price Risk Derivative Liabilities, at Fair Value	(309)	(583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(541)	(746)
Level 1
Price Risk Derivative Assets, at Fair Value	282	448
Other Assets, Fair Value Disclosure	18	17
Assets, Fair Value Disclosure	300	465
Interest Rate Derivative Liabilities, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	(267)	(480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(267)	(480)
Level 2
Price Risk Derivative Assets, at Fair Value	56	112
Other Assets, Fair Value Disclosure	10	9
Assets, Fair Value Disclosure	66	121
Interest Rate Derivative Liabilities, at Fair Value	(232)	(163)
Price Risk Derivative Liabilities, at Fair Value	(42)	(103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(274)	(266)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	40	42
Price Risk Derivative Liabilities, at Fair Value	(81)	(91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	3	52
Price Risk Derivative Liabilities, at Fair Value	(4)	(40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	16	97
Price Risk Derivative Liabilities, at Fair Value	(18)	(88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	10	20
Price Risk Derivative Liabilities, at Fair Value	(5)	(21)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	40	42
Price Risk Derivative Liabilities, at Fair Value	(81)	(91)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	1	8
Price Risk Derivative Liabilities, at Fair Value	(2)	0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	16	97
Price Risk Derivative Liabilities, at Fair Value	(18)	(88)
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	0
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	0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	2	44
Price Risk Derivative Liabilities, at Fair Value	(2)	(40)
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	0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	10	20
Price Risk Derivative Liabilities, at Fair Value	(5)	(21)
Commodity Derivatives - Refined Products [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	5	7
Price Risk Derivative Liabilities, at Fair Value	(4)	(15)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	5	7
Price Risk Derivative Liabilities, at Fair Value	(4)	(15)
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
Commodity Derivatives - Crude [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	51
Price Risk Derivative Liabilities, at Fair Value	(1)
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member]
Price Risk Derivative Assets, at Fair Value		1
Price Risk Derivative Liabilities, at Fair Value		(61)
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	51
Price Risk Derivative Liabilities, at Fair Value	(1)
Commodity Derivatives - Crude [Member] | Level 1 | Forwards Swaps [Member]
Price Risk Derivative Assets, at Fair Value		1
Price Risk Derivative Liabilities, at Fair Value		(61)
Commodity Derivatives - Crude [Member] | Level 2 | Future [Member]
Price Risk Derivative Assets, at Fair Value	0
Price Risk Derivative Liabilities, at Fair Value	0
Commodity Derivatives - Crude [Member] | Level 2 | Forwards Swaps [Member]
Price Risk Derivative Assets, at Fair Value		0
Price Risk Derivative Liabilities, at Fair Value		0
Commodity Derivatives - Power [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	44	48
Price Risk Derivative Liabilities, at Fair Value	(35)	(42)
Commodity Derivatives - Power [Member] | Call Option [Member]
Price Risk Derivative Assets, at Fair Value		1
Commodity Derivatives - Power [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	7	1
Price Risk Derivative Liabilities, at Fair Value	(6)	(1)
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	0
Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member]
Price Risk Derivative Assets, at Fair Value		1
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	7	1
Price Risk Derivative Liabilities, at Fair Value	(6)	(1)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	44	48
Price Risk Derivative Liabilities, at Fair Value	(35)	(42)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]
Price Risk Derivative Assets, at Fair Value		0
Commodity Derivatives - Power [Member] | Level 2 | Future [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - NGLs [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	162	291
Price Risk Derivative Liabilities, at Fair Value	(155)	(224)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	162	291
Price Risk Derivative Liabilities, at Fair Value	(155)	(224)
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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