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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Total derivatives assets	$ 255	$ 321
Total derivatives liabilities	(517)	(560)
Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member]
Total derivatives assets	0	14
Total derivatives liabilities	0	(2)
Not Designated as Hedging Instrument [Member]
Total derivatives assets	255	307
Total derivatives liabilities	(517)	(558)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member]
Total derivatives assets	166	262
Total derivatives liabilities	(206)	(281)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives [Member]
Total derivatives assets	89	45
Total derivatives liabilities	(144)	(58)
Not Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]
Total derivatives assets	0	0
Total derivatives liabilities	(167)	(219)
Fair Value, Measurements, Recurring [Member]
Price Risk Derivative Liabilities, at Fair Value	350	341
Options - Calls [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	(2)
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value		(2)
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	6
Level 1 | Fair Value, Measurements, Recurring [Member]
Price Risk Derivative Liabilities, at Fair Value	271	303
Level 1 | Put Option [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	2
Level 1 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value		0
Level 1 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	(13)
Level 2 | Fair Value, Measurements, Recurring [Member]
Price Risk Derivative Liabilities, at Fair Value	79	38
Level 2 | Put Option [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value		$ (2)
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member]
Price Risk Derivative Liabilities, at Fair Value	$ 0

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value as of the balance sheet date of price risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities on the balance sheet.

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