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

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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.

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- Definition

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)

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Regulatory Matters Regulatory Matters (Regulatory Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2012
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 395us-gaap_RegulatoryLiabilities	$ 664us-gaap_RegulatoryLiabilities
Regulatory Liability, Current	(150)us-gaap_RegulatoryLiabilityCurrent	(278)us-gaap_RegulatoryLiabilityCurrent
Regulatory Liability, Noncurrent	245us-gaap_RegulatoryLiabilityNoncurrent	386us-gaap_RegulatoryLiabilityNoncurrent
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/ Deferred Gain [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	63	127	127
Fermi 2 Refueling Outage [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	16	26
Energy Optimization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	14	25
Accrued PSCR refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	53
Refundable postretirement costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	48
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	33
Other Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 4	$ 3