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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Total derivatives assets	$ 266	$ 168
Total derivatives liabilities	(578)	(717)
Designated as Hedging Instrument [Member]
Total derivatives assets	6	25
Total derivatives liabilities	(12)	(32)
Not Designated as Hedging Instrument [Member]
Total derivatives assets	260	143
Total derivatives liabilities	(566)	(685)
Fair Value, Recurring [Member]
Price Risk Derivative Liabilities, at Fair Value	324	269
Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	2
Level 1 | Fair Value, Recurring [Member]
Price Risk Derivative Liabilities, at Fair Value	313	265
Level 1 | Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Level 2 | Fair Value, Recurring [Member]
Price Risk Derivative Liabilities, at Fair Value	11	4
Level 2 | Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	2
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Total derivatives assets	162	53
Total derivatives liabilities	(148)	(71)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]
Total derivatives assets	6	25
Total derivatives liabilities	(12)	(32)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]
Total derivatives assets	98	90
Total derivatives liabilities	(164)	(166)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Total derivatives assets	0	0
Total derivatives liabilities	$ (254)	$ (448)

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