Fair Value (Details Textuals) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]
Assets level 1 to level 2	$ 0	$ 0
Assets level 2 to 1	0	0
Liabilities level 1 to 2	0	0
Liabilities level 2 to 1	0	0
Unrealized losses on available for sale securities	(7,000,000)	(9,000,000)
Trading securities realized gain (loss)	14,000,000	22,000,000	11,000,000
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unrealized losses on available for sale securities	0	0
Nuclear Decommissioning Trust Fund [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	11,000,000	19,000,000
Average maturity of debt securities	7 years	7 years
Cash and Cash Equivalents [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Nuclear decommissioning trust fund investments	1.00%	2.00%
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Nuclear decommissioning trust fund investments	61.00%	61.00%
Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Nuclear decommissioning trust fund investments	38.00%	37.00%
Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	112,000,000	125,000,000
Restricted Assets [Member] \| Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	105,000,000	109,000,000
Other Investments [Member] \| Recurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	7,000,000	16,000,000
Other Investments [Member] \| Recurring [Member] \| Equity [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale securities	8,000,000	7,000,000
Other investments	$ 150,000,000	$ 136,000,000

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Nuclear Decommissioning Trust Fund Investments

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

-Number 210

-Section 03

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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This item represents the gain (loss) realized during the period from the sale of trading securities.

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