Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	$ 1,664	$ 1,841
Non-utility operations	902	1,143
Inter-segment Revenues	2,566	2,984
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(169)	(201)
Electric \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	1,153	1,203
Electric \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(9)	(9)
Gas \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	520	647
Gas \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	0	(1)
Gas Storage and Pipelines \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	67	57
Gas Storage and Pipelines \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(2)	(1)
Power and Industrial Projects \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	446	567
Power and Industrial Projects \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(148)	(180)
Energy Trading \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	549	711
Energy Trading \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(10)	(9)
Corporate and Other \| Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	0	0
Corporate and Other \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	$ 0	$ (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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- Definition

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.

+ Details

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