Segment Information (Details Textuals)	9 Months Ended
Sep. 30, 2011
Segment Reporting Information [Line Items]
Number of existing utility operating companies	10
Previous [Member]
Segment Reporting Information [Line Items]
Reportable Operating Segments	2
Current [Member]
Segment Reporting Information [Line Items]
Reportable Operating Segments	3
Regulated Distribution
Segment Reporting Information [Line Items]
Number of customers served by utility operating companies	6,000,000
Number of square miles in service area	67,000
Competitive Energy Services
Segment Reporting Information [Line Items]
Number of generation facilities from which the company purchases entire output	18
Number of facilities of which the company owns, operates and controls electric generation capacity	18
Equity ownership percentage by parent	59.00%
Generation capacity of the facility from which all the company's revenue generated	1,109
Megawatts of net demonstrated capacity of competitive segment	20,000
Competitive Energy Services \| AGC
Segment Reporting Information [Line Items]
Ownership interest	40.00%
Competitive Energy Services \| MP
Segment Reporting Information [Line Items]
Ownership interest	41.00%

Equity ownership percentage by parent.

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- Definition

Generation Capacity of the facility from which all the company's revenue generated.

+ Details

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- Definition

Number Of Customers.

+ Details

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- Definition

Number of existing utility operating companies.

+ Details

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- Definition

Number of facilities of which the company owns, operates and controls electric generation capacity.

+ Details

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- Definition

Number of generation facilities from which the company purchases entire output.

+ Details

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- Definition

Plant Capacity.

+ Details

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- Definition

Reportable Operating Segments.

+ Details

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- Definition

Service Area.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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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.

+ Details

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