Regulatory Matters Regulatory Matters (Schedule of Regulatory Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 820us-gaap_RegulatoryLiabilities	$ 1,164us-gaap_RegulatoryLiabilities
Regulatory Liability, Current	(153)us-gaap_RegulatoryLiabilityCurrent	(302)us-gaap_RegulatoryLiabilityCurrent
Regulatory Liability, Noncurrent	667us-gaap_RegulatoryLiabilityNoncurrent	862us-gaap_RegulatoryLiabilityNoncurrent
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	308	351
Renewable Energy [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	227	277
Over Recovery of Securitization [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	71	72
Refundable Revenue Decoupling [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	67	127
Pension Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	67	84
Refundable Income Taxes [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	33	45
Energy Optimization [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	24	31
Refueling Outage [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	16	26
Refundable postretirement costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	72
Accrued PSCR GCR Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	65
Other Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 7	$ 14

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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

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