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Organization and Basis of Presentation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Regulatory assets on the Balance Sheets
Regulatory Assets	$ 91	$ 40
Regulatory Liability	(2,498)	(2,720)
Net Regulatory Liabilities included on the Consolidated Balance Sheets	(2,407)	(2,680)
Change	273
Regulatory transition costs
Regulatory assets on the Balance Sheets
Regulatory Assets	49	46
Change	3
Customer payables for future income taxes
Regulatory assets on the Balance Sheets
Regulatory Assets	(2,725)	(2,765)
Change	40
Nuclear decommissioning and spent fuel disposal costs
Regulatory assets on the Balance Sheets
Regulatory Liability	(148)	(323)
Change	175
Asset removal costs
Regulatory assets on the Balance Sheets
Regulatory Liability	(787)	(774)
Change	(13)
Deferred transmission costs
Regulatory assets on the Balance Sheets
Regulatory Assets	170	187
Change	(17)
Deferred generation costs
Regulatory assets on the Balance Sheets
Regulatory Assets	202	198
Change	4
Deferred distribution costs
Regulatory assets on the Balance Sheets
Regulatory Assets	208	258
Change	(50)
Contract valuations
Regulatory assets on the Balance Sheets
Regulatory Assets	62	118
Change	(56)
Storm-related costs
Regulatory assets on the Balance Sheets
Regulatory Assets	500	329
Change	171
Other
Regulatory assets on the Balance Sheets
Regulatory Assets	62	$ 46
Change	$ 16

X

- Definition

The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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