Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	$ 1,435	$ 1,357	$ 3,099	$ 3,198
Non-utility operations	827	911	1,729	2,054
Revenues	2,262	2,268	4,828	5,252
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(174)	(236)	(343)	(437)
Electric \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	1,215	1,148	2,368	2,351
Electric \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(8)	(9)	(17)	(18)
Gas \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	231	218	751	865
Gas \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(3)	0	(3)	(1)
Gas Storage and Pipelines \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	69	57	136	114
Gas Storage and Pipelines \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(3)	(5)	(5)	(6)
Power and Industrial Projects \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	444	556	890	1,123
Power and Industrial Projects \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(150)	(215)	(298)	(395)
Energy Trading \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	476	524	1,025	1,235
Energy Trading \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(8)	(7)	(18)	(16)
Corporate and Other \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	1	1	1	1
Corporate and Other \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	$ (2)	$ 0	$ (2)	$ (1)

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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