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Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue Recognition and Deferred Revenue [Abstract]
Residential	$ 268
Commercial	151
Industrial	44
Direct access customers	10
Subtotal	473
Alternative revenue programs, net of amortization	(2)	$ 0
Other accrued (deferred) revenues, net	(17)
Total retail revenues	454
Wholesale Revenues	28
Other operating revenues	11
Total Revenues	493	$ 530
Net tax benefits due to the change in tax rate under the TCJA	15
Gain on Derivative Instruments, Pretax	$ 2

X

- Definition

Revenue from selling electricity supply in a retail access program.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(b))
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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
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Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity.

+ References

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-Publisher FASB
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Revenue from (1) electrical transmission, which is the bulk transport of high voltage power, typically over longer distances, between generating plants and distribution systems, and (2) electrical distribution, which is the delivery of electricity to a retail customer's home or business through distribution wires or facilities of regulated public utilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Revenue from the bulk transport of high voltage power, typically over longer distances, between generating plants and distribution systems.

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Aggregate gain on all derivative instruments recognized in earnings during the period, before tax effects.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The total amount of regulated operating revenues recognized during the period.

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No definition available.

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The amount of regulated power revenues recognized during the period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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