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Organization and Basis of Presentation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Regulatory assets on the Balance Sheets
Regulatory Assets	$ 1,014	$ 1,348
Regulatory Liability	(157)	(116)
Increase (Decrease)	(334)
Regulatory transition costs
Regulatory assets on the Balance Sheets
Regulatory Assets	90	185
Increase (Decrease)	(95)
Customer receivables for future income taxes
Regulatory assets on the Balance Sheets
Regulatory Assets	444	355
Increase (Decrease)	89
Nuclear decommissioning and spent fuel disposal costs
Regulatory assets on the Balance Sheets
Regulatory Liability	(304)	(272)
Increase (Decrease)	(32)
Asset removal costs
Regulatory assets on the Balance Sheets
Regulatory Liability	(470)	(372)
Increase (Decrease)	(98)
Deferred transmission costs
Regulatory assets on the Balance Sheets
Regulatory Assets	127	115
Increase (Decrease)	12
Deferred generation costs
Regulatory assets on the Balance Sheets
Regulatory Assets	215	243
Increase (Decrease)	(28)
Deferred distribution costs
Regulatory assets on the Balance Sheets
Regulatory Assets	296	335
Increase (Decrease)	(39)
Contract valuations
Regulatory assets on the Balance Sheets
Regulatory Assets	153	186
Increase (Decrease)	(33)
Storm-related costs
Regulatory assets on the Balance Sheets
Regulatory Assets	353	403
Increase (Decrease)	(50)
Other
Regulatory assets on the Balance Sheets
Regulatory Assets	110	$ 170
Increase (Decrease)	$ (60)

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- 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://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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X

- 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://www.xbrl.org/2003/role/presentationRef
-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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- Details

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