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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Price Risk Derivative Assets, at Fair Value	$ 266	$ 168
Other Assets, Fair Value Disclosure	36	34
Assets, Fair Value Disclosure	302	202
Interest Rate Derivative Liabilities, at Fair Value	(254)	(448)
Price Risk Derivative Liabilities, at Fair Value	(324)	(269)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(578)	(717)
Level 1
Price Risk Derivative Assets, at Fair Value	245	158
Other Assets, Fair Value Disclosure	24	22
Assets, Fair Value Disclosure	269	180
Interest Rate Derivative Liabilities, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	(313)	(265)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(313)	(265)
Level 2
Price Risk Derivative Assets, at Fair Value	21	10
Other Assets, Fair Value Disclosure	12	12
Assets, Fair Value Disclosure	33	22
Interest Rate Derivative Liabilities, at Fair Value	(254)	(448)
Price Risk Derivative Liabilities, at Fair Value	(11)	(4)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(265)	(452)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	14	12
Price Risk Derivative Liabilities, at Fair Value	(10)	(11)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	1	1
Price Risk Derivative Liabilities, at Fair Value		(3)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	2	13
Price Risk Derivative Liabilities, at Fair Value	(7)	(13)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	6	5
Price Risk Derivative Liabilities, at Fair Value	(2)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]
Price Risk Derivative Liabilities, at Fair Value		(1)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	14	12
Price Risk Derivative Liabilities, at Fair Value	(10)	(11)
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		0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	2	13
Price Risk Derivative Liabilities, at Fair Value	(7)	(13)
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
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Contracts [Member]
Price Risk Derivative Liabilities, at Fair Value		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	1	1
Price Risk Derivative Liabilities, at Fair Value		(3)
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	6	5
Price Risk Derivative Liabilities, at Fair Value	(2)
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Contracts [Member]
Price Risk Derivative Liabilities, at Fair Value		(1)
Commodity Derivatives - Refined Products [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	2	3
Price Risk Derivative Liabilities, at Fair Value	(2)	(11)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	2	3
Price Risk Derivative Liabilities, at Fair Value	(2)	(11)
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	135
Price Risk Derivative Liabilities, at Fair Value	(130)
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	135
Price Risk Derivative Liabilities, at Fair Value	(130)
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 - Power [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	14	4
Price Risk Derivative Liabilities, at Fair Value	(9)
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	1	2
Price Risk Derivative Liabilities, at Fair Value	(2)	(3)
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
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	1	2
Price Risk Derivative Liabilities, at Fair Value	(2)	(3)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	14	4
Price Risk Derivative Liabilities, at Fair Value	(9)
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	91	127
Price Risk Derivative Liabilities, at Fair Value	(162)	(227)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	91	127
Price Risk Derivative Liabilities, at Fair Value	(162)	(227)
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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