Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	$ 1,718	$ 1,664
Non-utility operations	(1,518)	(902)
Revenues	(3,236)	(2,566)
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(202)	(169)
Electric \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	1,175	1,153
Gas \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Utility operations	557	520
Gas Storage and Pipelines \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(105)	(67)
Power and Industrial Projects \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(548)	(446)
Energy Trading \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(1,052)	(549)
Corporate and Other \| Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-utility operations	(1)	0
Continuing operations \| Electric \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	12	9
Continuing operations \| Gas \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	3	0
Continuing operations \| Gas Storage and Pipelines \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	7	2
Continuing operations \| Power and Industrial Projects \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	168	148
Continuing operations \| Energy Trading \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	11	10
Continuing operations \| Corporate and Other \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1	0
Discontinued operations \| Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 202	$ 169

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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