Property, Plant and Equipment (Summary of Property by Classification) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment - Non-utility and other	$ 2,476us-gaap_PropertyPlantAndEquipmentOther	$ 2,292us-gaap_PropertyPlantAndEquipmentOther
Property, plant and equipment, Total	26,538us-gaap_PropertyPlantAndEquipmentGross	25,123us-gaap_PropertyPlantAndEquipmentGross
Less Accumulated Depreciation, Depletion and Amortization - Nonutility and Other	(867)	(767)
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(9,718)	(9,323)
Property, plant and equipment	16,820us-gaap_PropertyPlantAndEquipmentNet	15,800us-gaap_PropertyPlantAndEquipmentNet
Electric Generation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment - Generation	11,641	11,127
Accumulated Depreciation, Depletion and Amortization	(4,149)	(4,004)
Electric Distribution [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment - Distribution	8,164	7,603
Accumulated Depreciation, Depletion and Amortization	(3,067)	(2,947)
Electric Generation, Transmission and Distribution Equipment [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service	19,805	18,730
Accumulated Depreciation, Depletion and Amortization	(7,216)	(6,951)
Gas Distribution [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment - Distribution	2,946	2,834
Accumulated Depreciation, Depletion and Amortization	(1,130)	(1,129)
Storage [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment - Storage	448	431
Accumulated Depreciation, Depletion and Amortization	(142)	(138)
Other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment - Other	863	836
Accumulated Depreciation, Depletion and Amortization	(363)	(338)
Gas Distribution and Storage [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service	4,257	4,101
Accumulated Depreciation, Depletion and Amortization	$ (1,635)	$ (1,605)

Public Utilities Property Plant and Equipment Storage

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 1

-Subparagraph (b)

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

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- Definition

Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

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- Definition

The cumulative amount of depreciation (related to capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy) that has been recognized in the income statement.

+ References

No definition available.

+ Details

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- Definition

Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.

+ References

No definition available.

+ Details

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility distribution.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility.

+ References

No definition available.

+ Details

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- Definition

Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility.

+ References

No definition available.

+ Details

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- Definition

Period end amount of total gross PPE.

+ References

No definition available.

+ Details

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