Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	$ 1,748	$ 1,528	$ 4,847	$ 4,726
Non-utility operations	1,180	1,070	2,909	3,124
Revenues	2,928	2,598	7,756	7,850
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(210)	(223)	(553)	(660)
Electric \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	1,608	1,386	3,976	3,737
Electric \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(15)	(9)	(32)	(27)
Gas \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	160	153	911	1,018
Gas \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(5)	(1)	(8)	(2)
Gas Storage and Pipelines \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	63	61	199	175
Gas Storage and Pipelines \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(2)	(1)	(7)	(7)
Power and Industrial Projects \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	524	585	1,414	1,708
Power and Industrial Projects \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(178)	(204)	(476)	(599)
Energy Trading \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	782	635	1,807	1,870
Energy Trading \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(10)	(7)	(28)	(23)
Corporate and Other \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	1	1	2	2
Corporate and Other \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	$ 0	$ (1)	$ (2)	$ (2)

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

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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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