Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	$ 1,423	$ 1,435	$ 3,141	$ 3,099
Operating Revenues — Non-utility operations	1,432	827	2,950	1,729
Revenues	2,855	2,262	6,091	4,828
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	(194)	(174)	(396)	(343)
Revenues	(194)	(174)	(396)	(343)
Electric \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	1,218	1,215	2,393	2,368
Electric \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	(13)	(8)	(25)	(17)
Gas \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	220	231	777	751
Gas \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	(2)	(3)	(5)	(3)
Gas Storage and Pipelines \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	113	69	218	136
Gas Storage and Pipelines \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	(15)	(3)	(22)	(5)
Power and Industrial Projects \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	507	444	1,055	890
Power and Industrial Projects \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	(156)	(150)	(324)	(298)
Energy Trading \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	991	476	2,043	1,025
Energy Trading \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	(8)	(8)	(19)	(18)
Corporate and Other \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	0	1	1	1
Corporate and Other \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 0	$ (2)	$ (1)	$ (2)

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

No definition available.

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- Definition

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).

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of unregulated operating revenues recognized during the period.

+ References

No definition available.

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