For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of interest capitalized, including amount of allowance for funds used during construction.

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-Glossary Allowance for Funds Used during Construction

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Composite depreciation rate for public utility plants in service.

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Property, Plant and Equipment (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Public Utility Property, Plant and Equipment [Line Items]
AFUDC capitalized	$ 37	$ 33
Capitalized computer software amortization	77	71	68
Capitalized computer software gross	668	611
Capitalized computer software accumulated amortization	335	323
Capital leased assets gross	35us-gaap_CapitalLeasedAssetsGross	35us-gaap_CapitalLeasedAssetsGross
Capital leases, accumulated depreciation	$ 27	$ 21
Electric [Member]
Public Utility Property, Plant and Equipment [Line Items]
Disclosure of composite depreciation rate for plants in service	3.40%	3.40%	3.30%
Gas [Member]
Public Utility Property, Plant and Equipment [Line Items]
Disclosure of composite depreciation rate for plants in service	2.40%	2.40%	2.40%
Minimum [Member]
Public Utility Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	3 years
Finite-lived intangible asset, useful life	1 year
Maximum
Public Utility Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	55 years
Finite-lived intangible asset, useful life	27 years
Computer Software, Intangible Asset [Member] \| Minimum [Member]
Public Utility Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	3 years
Computer Software, Intangible Asset [Member] \| Maximum
Public Utility Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	15 years