Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Price Risk Derivative Assets, at Fair Value	$ 488	$ 272
Other Assets, Fair Value Disclosure	36	39
Assets, Fair Value Disclosure	524	311
Interest Rate Derivative Liabilities, at Fair Value	(144)	(387)
Price Risk Derivative Liabilities, at Fair Value	(381)	(211)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(525)	(598)
Level 1
Price Risk Derivative Assets, at Fair Value	393	248
Other Assets, Fair Value Disclosure	23	26
Assets, Fair Value Disclosure	416	274
Interest Rate Derivative Liabilities, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	(310)	(190)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(310)	(190)
Level 2
Price Risk Derivative Assets, at Fair Value	95	24
Other Assets, Fair Value Disclosure	13	13
Assets, Fair Value Disclosure	108	37
Interest Rate Derivative Liabilities, at Fair Value	(144)	(387)
Price Risk Derivative Liabilities, at Fair Value	(71)	(21)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(215)	(408)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	11	7
Price Risk Derivative Liabilities, at Fair Value	(5)	(10)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	16	38
Price Risk Derivative Liabilities, at Fair Value	(3)	(6)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	51	26
Price Risk Derivative Liabilities, at Fair Value	(50)	(9)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]
Price Risk Derivative Assets, at Fair Value	7	7
Price Risk Derivative Liabilities, at Fair Value	(4)	(6)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	11	7
Price Risk Derivative Liabilities, at Fair Value	(5)	(10)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	16	38
Price Risk Derivative Liabilities, at Fair Value	(3)	(6)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	51	26
Price Risk Derivative Liabilities, at Fair Value	(50)	(9)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Contracts [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	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
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 Contracts [Member]
Price Risk Derivative Assets, at Fair Value	7	7
Price Risk Derivative Liabilities, at Fair Value	(4)	(6)
Commodity Derivatives - Refined Products [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	36	3
Price Risk Derivative Liabilities, at Fair Value	(3)	(18)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	36	3
Price Risk Derivative Liabilities, at Fair Value	(3)	(18)
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] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	21	16
Price Risk Derivative Liabilities, at Fair Value	(7)	(3)
Commodity Derivatives - Crude [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	21	16
Price Risk Derivative Liabilities, at Fair Value	(7)	(3)
Commodity Derivatives - Crude [Member] | Level 2 | 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] | Call Option [Member]
Price Risk Derivative Assets, at Fair Value	1
Price Risk Derivative Liabilities, at Fair Value	(8)
Commodity Derivatives - Power [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	21	6
Price Risk Derivative Liabilities, at Fair Value	(30)	(4)
Commodity Derivatives - Power [Member] | Forward Contracts
Price Risk Derivative Assets, at Fair Value	88	17
Price Risk Derivative Liabilities, at Fair Value	(67)	(15)
Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member]
Price Risk Derivative Assets, at Fair Value	1
Price Risk Derivative Liabilities, at Fair Value	(8)
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	21	6
Price Risk Derivative Liabilities, at Fair Value	(30)	(4)
Commodity Derivatives - Power [Member] | Level 1 | Forward Contracts
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]
Price Risk Derivative Assets, at Fair Value	0
Price Risk Derivative Liabilities, 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 - Power [Member] | Level 2 | Forward Contracts
Price Risk Derivative Assets, at Fair Value	88	17
Price Risk Derivative Liabilities, at Fair Value	(67)	(15)
Commodity Derivatives - NGLs [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	236	152
Price Risk Derivative Liabilities, at Fair Value	(204)	(140)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	236	152
Price Risk Derivative Liabilities, at Fair Value	(204)	(140)
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